Well yeah, one, the most important, the one why no shop will take the time to go to bitcoin:
Nobody uses it.

I mean lets be serious I don't know how many bitcoiners are out there but I'm ready to bet at anytime that we're not even 1 million around the world.
So less than 0.1% of the global population.
Why would they even care?

I think bitcoins price over the nest few months will be very volatile in the run up to the halving.  i think in general bitcoin has a way to go yet before mass adoption.

well you need much more than few month, for real adoption, you need 5-10 years, so sit down and watch, because it's not a thing that can happen overnight

another thing to add is that you can actually need to buy bitcoin, where fiat is earned directly, you don't need to buy it, this might seem not an obstacle but it's in realiy it's an huge one

All of this were very much known already in the bitcoin economy, and because of the reasons you stated above, people most likely wouldn't want to deal with bitcoins especially with their businesses. Give bitcoin a few more years to established itself in this world economy and see whether people would reconsider.

Real mass adoption will need several more years.I'm not a believer of the theory that we will see an unexpected influx over night just because of the next coming crisis. It will be a long term and slowly process, something like 10 years at least if you wanna have hundreds of million or a billion users and shops all around the globe dealing with it. Sounds disappointing but that is how I see it.

Thanks for the stats.
Hard to get a good estimation on the number of bitcoiners indeed, what about all those who don't have coin base but another wallet, but also all those who have a coinbase adress or multiple coinbase adresses plus other exchange plateform/wallet. I personally have something like 8 accounts in total, wallet online desktop and plateform exchange included.

But yeah the most important part of that is the incredible number of inactive users :/
1 million seems like a huge estimation in fact!

Well you may have a point here but I would like to answer base on the country I'm residing since each one of us have different situations regarding this matter. The main problem that haven't used BTCitcoin here is their lack of education regarding how it works (that's it), simple as that. There are two shops here who accept only BTCitcoin as their only means of payment and one of them is well known and keeps selling shoes to foreign buyers as well and has been few years and haven't seen a single problem with them that exist for using this kind of payment. Believe it or not, in where I am at the moment, only few use PayPal since it's banned here and BTCitcoin has higher percentage ratio of users among other available online methods of payment (even those that are not banned here). From what I'm seeing, it won't take too long for most merchants to accept BTCitcoin as well (next 2 years perhaps will be the time frame).

merchants have their goods priced in fiat value. when the customer goes to checkout, the merchant at this point gets bitcoin valuation. Although you may think there is a 10 minute+ chance of price change, most middlemen services take the hit on that small time and base it on the time when the merchants requested the valuation, not the time the funds are finally settled.

other merchants who dont want to convert to fiat, dont care about volatility as they are obviously hoarding anyway, so short term changes are meaningless

Ah ok, instant transformation from bitcoin to fiat.
But well, such a thing is a bit useless in the sense that it becomes perfectly similar to fiat ^^

...

My guess is that the reason merchants ("brick & mortar" selling to the public) don't use BTC is that it is too complicated!  Too complicated for the Average Joe to get BTC and to use it.  And the merchants themselves would have to get set-up.

franky1 wtote above that there are some 1,000,000 users of Bitcoin.  There are 320,000,000 or so living in the USA.

I think it is going to take a while...