You know... as I said on the initial announcement, I'm sure X-Com 2 will be an interesting game, and based on the pedigree and talent brought to bear on the "original reboot", probably a good one.
But it does kind of suck to effectively have it come down from on high that your "investment" in the first game doesn't matter; you just lost.
This isn't like Spec Ops: The Line (or Bioshock: Infinite, YMMV) where the game has a specific journey in mind for specific characters that requires those characters to stumble and fall. This is a game where countless players went through a long and often difficult (enjoyable, yes, but difficult) series of challenges in order to bring about a successful conclusion; also a game in which much of the personal, emotional investment in specific characters was something players created for themselves out of the semi-random statistics the game crafted and evolved to represent them.
I'm not altogether fond of "and now, despite everything, you still lose" kind of trope that seems to be occurring more and more often in games; I'm less fond of the idea of a dictum of failure out of the blue coming from on high in between games. I think it behooves developers to have some measure of respect for the hours players put into their games and the emotional involvement they feel with them. That's the bread and butter that makes both a fanbase and a successful franchise; you trivialize such things at your peril, and something much of the bitter sniping about "entitled" customers often just don't seem to understand.
All that said, I'm not saying that these things can't be done at all. I've said before that I find bad endings oddly fascinating (though I much prefer them in the context of "good endings" actually existing.) But I'd be lying if I said I liked the idea of "bad ending default" becoming the standard; as an experiment, that's okay, but as a baseline, I think that's a crap way of treating your players. Think about what you're doing and if you have good reasons and a firm understanding of why you're doing it. Don't just scoff at players' commitments as meaningless.