No, I don't think it's doomed. From what I've read, it's been a great financial success so far, but money aside, will it be judged as a failure in 1-2 years' time? This is really up to what Firaxis pours into it in the way of patches and expansions.
Quite obviously, it was rushed out the door half-finished for the Xmas shopping season. They have limited dev manpower and getting 1upt to work must have been more than they bargained for. The result, diplo was to be "inscrutable" because they didn't have the time to develop it properly. Overall the game was going to be "streamlined" because they just didn't have the manpower to do everything that should have been done. The whole "dumbing down" looks very much like it is the result of too much to do and not enough time or manpower to do it.
So hopefully they'll flesh out the skeleton with some very hefty patches and expansions, giving us real diplo, a revised diplo victory, rebalanced yields/build times, a functional gui, a decent victory screen and replay, multiplayer, etc, etc.
I think they better continue working on CiV full time for another year at least if they want to be able to sell Civ VI as well as they did this one.