Every time I see blockchain proposed to replace existing processes I see few remarks on the investments required to set up a "shared, distributed database that spans multiple organizations".

I'm pretty sure the regulators will require these databases to have a high level of security (which is built in, blockchain adepts will say), a high level of resilience (per bank, not as a 'distributed' system). This will drive up cost.

On top of that, a distributed database of investment transactions must be able to handle the load of the many millions of such transactions per day. The data will be replicated, which will require tons of storage. And the systems will need to be fast, tons of servers required.

So, I'm not so sure this will happen in the near future.

My mercedes C200 uses 5.3 liter per 100 km, as is the common way of expressing fuel consumption in Belgium. This is equivalent to 44.3 MPG. But it's a diesel.
Now some here are pro using more (and better) diesel in the States, but beware: studies have proven that diesel motors are one of the major sources of fine dust in the air. Of course, the better part of it is from the big transport lorries, but still this has spawn laws to make particle filters standard on all new cars etc.