......clone blockchain sites) that you mention will have to go through the same teething pains as Steem has been through as they mature

There is no doubt about that. What matters is though that if they stick to their cause, a few of them will make it through. Although I am not so confident for the steemit clones but I do think that some of the other projects from EOS are in a pretty decent shape.

The good thing is that in the upcoming decade we have plenty of room to grow and I feel that the competition can grow as much as it wants but we would still have room in the larger blockchain ecosystem. This room will become gradually narrower as we move ahead in time so it makes sense to press our advantage..... pedal to the metal, literally!