Probably we could use other top 10 cryptocurrencies when it comes to transactions and bitcoin just for investment, or we could just stick to stablecoin because of its stable market price we can rely on its value that it is not going to depreciate over time when you just want to buy online or have a transaction online.
Litecoin, XRP, TRX and Doge coin (only to name a few) must be the first few candidates for this. So far never saw a bank in my local who supported Bitcoin but maybe you are talking about a third party platform who just do a conversion from bank to crypto and vice versa? Bitcoin is still hot in the eyes of the banks but who knows, maybe they will be cool with it later on and finally support it on one of their service.