You've made two major statement that are completely false and far from what will play out in the future or decades to come. The first is the assumption that crypto will replace fiat and the second is your believe that bitcoin will go down to the zero point in the next decade. Fact is that those kind of assumption are too extreme and even though we can't be too certain of what will play out in the future, it's obviously that crypto cannot completely replace fiat neither will bitcoin go completely extent while crypto remains.

It would have made more sense if you are particular about a coin you think will continue booming while bitcoin goes extinct. That bitcoin has continued to move a bit slow doesn't mean that it's going to with time go extinct. The direction it's going at is upwards so what we ought to even consider should be that in the next couple of years, bitcoin would have surged really high and not the reverse where you think it's going into extinction. I don't even see that kind of thing ever happening.