It is only "doomed" to those that can't see beyond their own biases and preferences. It's only "doomed" if pessimism is the dominant attitude held by fans of D&D.
5E will fail if it caters to any group, be it 3E/3.5E holdouts, Pathfinder converts, Old School grognards...and yes, even 4E Fans.
It will fail for
each of those groups individually if it also doesn't appeal to each of those groups individually.
5E will not be the game for everybody, but I think it will end up being the game for most of us...from all editions and preferences and corners of our fanbase.
I prefer Optimism until shown that it isn't for me. Give it a chance. Don't condemn it before even seeing it.
Pessimism serves nothing constructive. Instead, try being an active part of making it a game that works for both you and everybody else. If everybody did that,
AND WotC LISTENS this time around then it
MIGHT not fail.