I have to admit I really like the proposal. I had thought of one last possession for the team that starts on D, but couldn't figure out what to do if team one scores a FG and team 2 scores a TD. Should team 1 get another shot to win since they weren't stopped? And if team 1 scores a TD, and team 2 got a chance to answer, they have the advantage of being in a must score situation where they know they are going for it on 4th down.
But this version says if you give up a TD in OT you are done, even if it's on the opening possession.
I really like the fact that it will eliminate the "get the ball first, drive it to the 30, then lay down and kick it" mantality. Teams will need to go for that opening drive TD because they could turn around and lose the game if they choose to kick the FG.