I'm very happy to hear Mearls talk about "opt-in complexity."
The fact that 4e really
doesn't have that -- you can't opt out of tactical combats or character builds or the need to use a character sheet that looks like a bloody 1040 tax form -- is the reason I've avoided that edition like the plague.
A 5th edition that keeps all that stuff around but makes them optional from group to group, from campaign to campaign: that's how it should've been from day one.
So if this is going where I think (hope) it's going, it will vindicate at least one old adage we have in the hobby:
Watch the even-numbered Trek movies; play the odd-numbered D&D editions.
(Only, not really, since Search for Spock and 2nd edition are awesome.

)