goog question, i think bitcoin could have the theoretical potential to become the next banking system.

BUT only theoreticaly, and only in a far theoretical future.

before bitcoin can become the next banking system it has to overcome major obstacles, such as raising the transaction rate.
in order to be a major bankiing system youll need a fucking high transaction rate. and im speaking about probable millions of millions
of transactions per second. before bitcoin can be there we will need a lot more nodes in the lightning network.
thats a hard obstacle to overcome if not very very hard obstacle at least with the current version of btc.

another big proboem would be the private keys, currently there is noway to keep private keys save and easy assesble at the same time.
as saver the private keys are secured as unconvinient they are to use. unless we dont find a solution for that it will stay a far future.

a next big problem is definitly the energy consumption, imagine millions of transactions on the btc blockchain. and imagine how much energy
the mining process would require.

theory is good but practically i dont see no way that btc could become the future of banking, at least not with the current code. maybe with PoS the could be a little chance but i dont think so.
maybe as digital gold btc could find a place that could fit his properities perfectly.