In the future, there will be one vehicle that does everything.
We're already moving away from specialization in the air. The F-35 is capable of air superiority, close air support, bombing enemy industry, conducting electronic warfare, reconnaissance, mid-air refueling, and VTOL flight.
IFV's are already capable of scouting, reconnaissance, anti-tank activities, infantry support, transportation, delivering supplies, and commanding troops. The concept is continuing to be refined to encompass even more roles.
Someday, all vehicles will be condensed down into a single vehicle that can float, submerge, fly, and drive across all terrain, and do every feasible role. Warfare will be entirely down to who can produce more of this weapon.