Legit!.
But there's more to BitShares. Most of the assets have established themselves and it is highly unlikely that they will move to a platform that lacks infrastructure.
I am also of the opinion that each platform has its own unique customer base and history has proved that the launch of Binance didn't kill Bifinex/Bittrex or any of those major exchanges who are centralized and easy to set up. So, it is highly unlikely that EOSfinex will kill BitShares anytime soon.
RE: EOS Impact on BitShares and Steemit will be Ultimately Positive