Additional thought:
With all 121 pilots getting ATPs and a PIC type rating and assuming the numbers hold up at the majors and hiring starts up like gangbusters in the next year or two, RJ captain time is really only going to be good for satisfying your ego. As far as hiring at the big boys goes, I think RJ PIC is going to matter less and less going forward. So with that said, in my mind, upgrade time becomes less relevant while QOL and pay become more relevant while you wait for the next step.