It's not just Wall Street. If you have a minimum $9,000 in capital, you can access the CBOE futures markets through typical broker-dealers. TD Ameritrade (standard pleb broker) allows access to Bitcoin futures markets starting this week, for instance. That allows mainstream/middle class investors exposure through mediums that are more familiar to them.
And ETFs will be even better. That'll give people easy access to Bitcoin exposure that they can roll into their retirement accounts (401ks, etc).
It makes cryptocurrency more legitimate, but in time, I think these markets will have more effect on price discovery. It all depends on where the volume goes.
If Wall Street tried to suppress the regulated markets, Main Street could still run them over. That's what happened after the CBOE launch.