Steem Engine isn't going to go anywhere, in my opinion. It's highly centralized and will likely run into legal issues, which will mean either KYC for all users and token creators or getting shut down.

There's a reason why SMTs and a DEX were going to be created on the consensus layer of Steem. It keeps it decentralized (like Bitshares) and pretty much off the SEC radar, as there is no central money-changer.

Of course, we have to get SMTs and a DEX first. But if it ever happens, it will likely put Steem Engine out of business anyway.