Yeah, I can't stand when a thread starts like this, with a claim that a pronouncement was made by someone and no reference links are provided.  It's hard to comment on something that I don't really know is true.

But let's assume the IMF said what it said for the purposes of my post.  I don't know how much developing countries and their citizenry value their currency, and I assume it depends very much on which country we're talking about.  If it was a country like Venezuela, then I'd say crypto might pose a threat to their fiat currency, but even during their hyperinflationary crisis I didn't hear tons of credible stories of how bitcoin or any of the altcoins were taking over; I think Venezuelans used the US dollar as a substitute currency.

And this just isn't true:

Bitcoin has been around since 2009, and most people still don't own any--and pretty much everyone uses the internet.  So that should tell you with no ambiguity that bitcoin hasn't gained any dominance over traditional payment methods.  A lot of people shop on Amazon and related retailers online, and what do people have to pay with?  Their credit or debit cards, not bitcoin.  Bitcoin isn't even close to "taking over the internet for online transaction".