I don't really care about JPM coin and it was already hated and it won't succeed. But talking about Fbcoin, I feel already going crazy on what is going to happen when it gets release and listed. I know that many whale traders or rich traders group will use this opportunity to ride its wave and pump a lot of the digital assets. Just imagine that magic of Fb's Globalcoin getting paired not just with btc but also with the several top altcoins.
I doubt Globalcoin will be trading on cryptocurrency exchanges. Though if it is I think that would be fantastic. That simply provides people with another on-ramp into crypto. If facebook allows people to easily and quickly convert fiat into globalcoin, and people could then send globalcoin to an exchange and buy crypto with it, that'd be a huge new easy on-ramp to bitcoin and the crypto world. I'm not sure Globalcoin will actually succeed the way Zuckerberg hopes it will, but if it does I think that'll help Bitcoin out a lot by making it even easier to buy bitcoin.