Bankers may use it as a settlement channel, or lend (pieces of paper redeemable for) it at fractional reserve. But there is absolutely NO way that bankers will not figure out how to profit from it.
Btc can evolve, and change.. I know it's hard to image with it's current state.
It will evolve but to a certain limit, there is absolutely no way it can let other type of currencies dissapear since the use of bitcoin is primary online and not accessible, put to use in any offline environment. That's the limit of bitcoin and thus there it will stop evolving.
Which basically means that if Bitcoin is becoming a problem for the governments they will come up with new policies to make Bitcoin usage very difficult.
i see a lot people dream about bitcoin replacing banks and fiat currencies, but what's the point of that? what's wrong with bitcoin being just an alternative that can perfectly fine exist alongside fiat currencies and all other tools?