No, I really did not hear about competition in currency area and how it helps with innovation. Maybe you or some idiot wrote some nonsense, but I suggest to leave idiots aside.
What I read were just theories - and they were prooved - how one currency
the strongest kills all other currencies in certain area. Since blokchain has no borders, there is no need for more currencies, because national states donot exist for cc or in other words the
Optimum currency area is whole world.
Maybe there is some need for other cc to exist, like extend anonymity through better mixers, but only one cryptocurrency will become money.
It is truly stupid assumption to think that it is good for consumer to own many currencies, when the major one has to be deflationary_stable. Even more idiotic is to think that future highly competitive electronic market will reward merchants who will spend resources on exchange rate fees that are fancy, but do not bring anything good.
Money definitely tend to monopolisation when left to market powers.