The problem of Asylum as discussed in this thread would be positionning in Extreme / Savage content. Mind me, Earthly Star is similar buf you don't have to stand in it for the whole duration of the effect, just like Collective Unconscious can now be popped as an oGCD and give a roughly 5sec shield to people around.
To get the proper effect of asylum, you need to stand in it, for up to 24 seconds. If you have a prey marker, a tower to take, a bump to prepare, a link to take/give, an AOE to avoid, then you are losing from the full potency of it.

Asylum as it is now is ok for dungeons, for Main Tank extra regen in all content, and it is risky as a raid regen for the same reasons I just listed (where a Medica II / Individual Regen / Fairy regen will do the same for less positioning requirements. It is a MP economy for the WHM but we know that MP is not so much of a problem for WHM with the current kit.

I'd rather have something similar to AST where you pass in the Asylum, get a regen buff and then move out as you wish, maybe have it reset if you go back in (but that is a bit tricky to handle with server ticks), as other people have said before