You know they're making an X-Com strategy game, right? And that it's actually releasing before the FPS reboot/"revival"?
Besides, why merely port the mechanics of a decades-old strategy title? You'd be better off ripping off Valkyria Chronicles, which to me is the definitive way that tactical strategy games should play in the modern era.
I didn't know a strategy game was coming, but will retain doubts that it's a true successor until proven otherwise. (There have been dozens of games claiming to be the next X-Com and none have pulled through. Not even the myriad X-Com sequels.)
Valkyria Chronicles is a fine game. Full respect to it. But it's not X-Com, and provides a very different type of overall experience.
Did you play Rebelstar: Tactical Command on GBA? It had its flaws, but I really enjoyed it, and it was a full-on X-COM ripoff.
Owned it, played it, beat it. Fun game... but nowhere near X-Com. Like many other modern tactical games, the levels are all preset and predetermined instead of having key elements generated randomly, you don't have base-building or any real strategy to pursue, there are no meaningful research trees or resource management, etc etc.
Rebelstar gave me the same feeling as Ghost Recon: solid game, worth playing... but ultimately kind of empty and with limited replay value.
X-Com Terror from the Deep, on the other hand, provided one of my proudest gaming moments when I finally walked into the final room and took out the ultimate alien threat.