Institutional investors can bring stability and liquidity to the Bitcoin ecosystem. They can also help to legitimize Bitcoin and make it more mainstream.what you think about this as a crypto guy ? 
This is very correct. Many people are scared of Bitcoin because of volatility... their fears is justified. By the time we have institutional investors getting heavily invested in Bitcoin, the liquidity will be huge such that it becomes difficult for few buys or dumps to drastically cause price fluctuations. For a coin with low liquidity, a single buy or sell of less than $1000 can alter the price significantly and this is not healthy. So, just like you have already stated, institutional investors is good for Bitcoin and until we have more of it, mainstream adoption of Bitcoin and Bitcoin becoming a legal tender in many jurisdictions, will continue to linger.