Though new people will come and when the industry grows, the trust will follow. It's all really about trust - that is already the basis of our economy, blockchain can just make it massively more better and scalable. Ironically, people don't fully trust it will take off. Yet.

Many more are going to be coming in and those who have left are numerically insignificant percentage-wise. It is a pity perhaps, but all new tech has a high attrition rate before it solidifies and gets trusted.