Let them leave, competition is good for this space. Though I have to be honest, if these places (WeKu, Trybe, Smoke) think it's going to be a piece of cake developing a working cryptocurrency social media site, they're in for a shock. Can they do it with Steemit having 2 years head start on them? Maybe, with how dysfunctional the development here seems. It remains to be seen, but at the present, Steemit is the best out of these systems by far.