Many good posts here on this topic.

The modern tank faces an ever growing number of perils. "Intelligent" artillery rounds with EFP, huge and sophisticated IEDs and mines, a wide array of guided rockets fired from the ground by man and machine and delivered by air, powerful kinetic penetrators and possibly an ABC attack. It is a huge strain on logistics because it difficult to deploy and needs huge amount of fuel, with all the cascading effects through the supply system. Still it brings unique qualities to a battlefield and profits heavily from modern technology. Hardkill defense system may shield tanks from a great part of its thread spectrum, better and more integrated sensor allow for greater agility, better situational awerness and combat effectivness. Modern rounds give them a fighting chance against helicopters and better abilites in Urban Combat.

I guess that in the future MBT will be number-wise a smaller part of a modern army, but still one of intrinsic importance.