Would people buy us stocks with Bitcoin? The pump will happen if that's the case. Alot easier to buy with Bitcoin. Only if us markets accept Bitcoin.
There is an issue of ownership in that case. When you buy stocks from your bank or from some investment third party middleman you pay them to make sure YOU own those stocks that you paid. However when you use bitcoin you do not have an account somewhere or you do not share your personal information as much as you share with your bank.
I do not have any trouble sharing my moms maiden name with my bank but I do not prefer to do so when it comes to some new bitcoin stock thingy. Hence, it would create a challange to get those stocks under your own name if you pay with bitcoins. Moreover, it would be amazing if Banks finally manage to create their own crypto wallets and allow you to store your bitcoins with your bank like you do with your fiat and than you can spend your bitcoins to get stocks however you want.