most of the time I tend to agree with you, on this occasion i tend to disagree. Bitcoin will liekly be the most widely used and adopted because it already has a global use case, has a fair distribution and it is the defacto crypto. People have choice. their bank accounts aren't tied to euros, USD or any other fiat, that's the whole point of crypto. Bitcoin can be witdrawn from global ATM's around the world and exchanged into local currency, that's just one of the things that make it so amazing.
To your other point, FOREX is a massive thing that millions of traders do everyday around the world, so the answer to that question is yes, lots of people love seeing the value of the currency they hold go up, compared to other currencies