You just want threats to the network? I guess there's not much other than spam. I think the biggest threat outside of that though are strict regulations and apathy and cynicism from the mainstream.

The crypto is solid. Bitcoin will last centuries.

Whether or not people use it is up to people.

The biggest threat would be demonisation by banks and governments who are afraid they cannot get a grip on BTCitcoin and have no way to regulate that what has driven them for so long, money and the choke it has on people so they can be slaves to the economy is going to slip away slowly and there is nothing they can do, or so it seems, they have deep pockets and a wide array of channels to posion the minds of the majority to take a stand against BTCitcoin.  This is what might undermine the blockchain, make the users, miners and believers into paria's, outcasts of society.

Centralization and blockchain bloat.

My biggest problem is with new users that come in here and post some Panic Threads from time to time. I mean why don't they just lean back and try to understand the system.

That, yep.

Seriously, does it not occur to them that in the past 6.5 years of Bitcoin, perhaps somebody else might have had the same idea? (especially coming from them as total newbies)

not now of course but read my last part of that quote, the possibility is there

I think the biggest threat is the need to make the block size larger. It's not really a problem at the minute but it will be in the future, but I hope its sorted long before then.

Well a major threat would be the refusal to use the search button. There have been countless discussions to this very subject.

I'd say that the only real risk is a 51% attack. Besides that, the only real threats would be events that could possibly destroy or severely damage our planet/civilization. Something in the lines of a Hypernova in which the gamma ray burst is directed towards Earth. People shouldn't worry about 51% that much, nor about possible weaknesses in encryption, as Bitcoin can always get upgraded/fixed.

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Nonsense. That's not a threat at all.

Neither were the spam attacks, and yet they happened.

ISP's can't shut down a node if they do not know that it is a node. Exactly what I'm doing under a VPN, the ISP does not know.
Bitcoins can't be destroyed, but rather abandoned. Even if we are left with only a single Bitcoin, we can divide it enough times for everyone. If Satoshi does sell his stash, that would only have an affect on the price (supply and demand).

Legislation against crypto in general is of concerns to me, I definitely could see with the upcoming election year in the US hitting some obstacles from candidates funded by the financial institutions.