Aren't a lot of them volunteers? I don't think they're in it for the money. Either way, it's still an open source project, meaning we shouldn't get a shortage of talent for as long as there are people who care for the well being of Bitcoin.

Examples like Mike will always be there in any industry whether  it is related to finance or not. The sabotage attempt was a different story though!

But if a talented developer wants to leave his responsibility towards  bitcoin code development for a fat package, we can't blame them either because money is needed in every segment of life! I would not wonder if more developers receive fat package offers from IT conglomerates. Retaining talents was always a challenge for open source projects where majority of the talents are working voluntarily.

But the way Bitcoin has retained its position as a top order open source project, it should never face any challenges to retain top talents! Reputation matters a lot of this market! Not everyone will want to loose that reputation of being involved in bitcoin core development team! So we will see a steady flow of developers to take on any vacant position that may occur!

Developers are people too, and they have their side projects they work on. It's perfectly fine considering that it doesn't lead to any problems at all, and it may be a great thing too because it makes you focus on other things.

I haven't seen many developers constantly working on one single thing. Just imagine yourself doing the same thing over at your job all the time, it would piss you off and you will go to your job unhappy.

Exactly that. Some developers don't gain a single penny for their contributions-- the passion and the goal alone is already enough to keep developers dedicated to Bitcoin. Where else do you find that in crypto?

lets not confuse money grabbers and ICO scammers with everyone and actual trends that are going on in the real world. last time i checked the "real world" nobody was using the blockchain technology and majority of the experienced developers were considering it useless in anything but a decentralized currency like bitcoin.
here is a good case: https://insights.stackoverflow.com/survey/2019#blockchain-in-the-real-world

the real question is "should it matter?".
if we believe bitcoin to be decentralized, it should never depend on a handful of developers. and it is not. there are many good developers familiar with Bitcoin protocol and have been contributing to advancement of it. if something happens to current developers (natural disasters, moving on to other things,...) they will simply be replaced.

Just take a look at other projects. Did Linus Torvalds abandoned Linux when getting hired? No, if anything they could insist in their contract their work in other projects remain separate and not subject to company ownership, etc.

Many free open source developers get hired by companies but they keep doing their work in the projects they lead outside their employer.

Well many of them have jumped board. The current leaders of crypto project form different enterprises are once the prominent member of other projects. It's better for them to work a paid job than to volunteer in hope of anything that they hold may be of large value someday as even if they don't volunteer, someone would still work and the price would still rise.
Yes, they have been moving and decentralized and open source projects are lacking volunteer developers.

the first half of your statement, I have no doubt, but the part in bold there, I don't think the blockchain is a subject broad enough to be considered for a major, its too niche to make a 4 year program out of. a few classes here and there, I could definitely understand, perhaps that's what you meant?

the example you gave in this case might hold true, but the corporate world isn't always so kind; some of the bigger companies (facebook being a relevant example) might include clauses in their contracts stating those devs cannot touch any other blockchain crypto related products while they work for the company. and depending on the paycheck, the dev might choose to forgo their other projects.

A lot of them are doing it during their spare time and as a hobby, without being paid. Not all are working for a blockchain company and they will surely continue if they're hired.
Bitcoin is something and the blockchain is something else. It's like asking will you continue to play football with the high demand for Mac Donald

You can't really blame them even though i believe principles matter too.
 Hopefully they won't abandon the community completely or hopefully they get lucky, get  part-time jobs and still get paid well.
In the end we could be left with idealistic ones?

bitcoin have a lot of developer or contributor and i think its really impossible for all of them to leave the development and as of now even without further development bitcoin function will still continue but anyone can contribute in bitcoin development as long as it will fix some problem because its open source.