My fear is that if Wall Street actually gets around to invest in Bitcoin, they will not issue any actual Bitcoin to their customers anymore than they are issuing actual gold bars to their customers. They will just sell 'paper Bitcoin' or bitcoin certificates to their customers
Cash-settled Bitcoin futures are essentially those bitcoin certificates
And they have been around since November 2017 if I'm not wrong on the dates. However, they didn't attract a lot of investors, so there is no reason to think that these certificates would necessarily do better. And keep in mind that they can't fool anyone into thinking they have real bitcoins while there are in fact none
The rumors are circulating non-stop that there is less gold in the COMEX vaults than the amount bought with physically-settled gold futures, and that may in fact be true. But this trick is set to fail with Bitcoin as it is easy for everyone to see on the blockchain how many bitcoins they actually have