Sure this sounds okay in principal ... but remember the game already went for 6 months (and had been extended once already). I would hope 6 months is enough for any game.
Maybe in the future we shouldn't allow endturn polls before gamestart anymore. It's impossible to know beforehand how a game will end up, and hence whether a fixed endturn will be called for or not. In this game I think it's a shame because we're actually reasonably close to a natural end with a winning team.
If a game gets totally stuck then we can always still open an endturn vote at that moment.
I also thinks it's good in principle, as long as we do not engage in very large maps... I think the T180 limit was a reasonable precaution, since for a while it seemed almost impossible that any one alliance could conquer the whole map. Who would have thought it actually became possible!