Alpha Centauri is probably one of the deepest turn-based strategies on the PC so it would be a travesty to see X-COM style reboot jumping genres. I somehow doubt we will ever see the same complexity in gameplay again. There is honestly no real way to manage all the details that game had on a gamepad. For myself personally what helped Alpha Centauri standout above other 4x turn-based games was the unit creation/customization and trying out new strategies.
Sid Meier and Firaxis need to be involved deep in the design of the new game and not in name only.