I think steemit still has advantage for being the first with the fact that so many people have already grown a reputation they will not like to abandon.
sm1 like me do no like muti-tasking too much...so not everyone will want to move to give other sites a try.
i think steemit should make use of the advantage it has now to stay in the front page.
The other competitors onboard are not strong enough. Most bounty programs dont even recognise them