Although I think all this highlights the massive unmet need for high risk investment vehicles. The stock market has become huge, slow moving and boring, where the already-rich make slow gains on top of their existing fortunes. The only companies that bother to IPO anymore are basically pump and dump crap (blue apron, snapchat). Private equity and VCs are snatching all the action for themselves. Why the hell can't I invest in uber? I would take less equity and provide more capital than all their current investors.
The ethereum network now provides everything we need to offer and trade equity - etherdelta has shown that decentralized exchanges based on the ethereum network work. So this really can't be stopped now. It may not occur in USA or China's jurisdiction, but its going to keep happening.