The future combat vehicle's planned capabilities are impressive, but assuming the technology can be developed, it's at least ten if not 20 years away.
The weapons you describe don't address the problem of increasingly sophisticated ATGM's. Fortunately, Saddam acquired few Kornets due to the embargo and relied on old RPG's. That's not the case with other potential adversaries. Sending Strykers or Bradleys with no tank cover into that environment would be suicide. It makes no sense to shift to less survivable vehicles in a more lethal environment. We can't assume we'll always go up against an enemy starved of technology by a 12 year embargo, but may go up against an A-Team armed with the latest Russian-developed technology. So, there's no alternative to maintaining a tank force until FCV is available.