I'll do Ullmark as our starter. He looks ready. Has performed ready. Its time.
There are no gurantee's of Hasek or Miller, there are, of course, no gurantee's Ullmark can't perform at that level.
What I can surmise is this, he's an option that removes the current disaster in goal.
He's done well to this point, give him the job starting next season and the contract to boot.