The wrong track

"However, the need for firepower is not going to go away and precision indirect fire reduces the need for heavy direct fire, things like anti-armour sensor fuzed munitions delivered by 155mm shells against tanks and precision HE against other targets eliminate most of the need for things like main battle tanks"

In war, you're not the only one doing the shooting. If the enemy doesn't have to tear up main battle tanks because you've already done it back on the parade ground, what might the enemy do with its spare time and munitions? To whom will it turn its attentions, my boy?

You're not always going to be tasked with reducing schoolhouses and being allowed six months to trail up into a region by foot and truck.

"For many tasks smart rockets fired from trucks are a lot more cost effective than smart rockets fired from hugely expensive aircraft (or even somewhat less expensive unmanned ones)."

How fast can a truck run? Whatever the enemy created to tear up a "main battle tank" and pull down a supersonic screecher flashing past mountain tops and swamps could have a lot of fun with your little tarpaulin-clad buddies trundling along at 40 mph and juddering to a halt at Taliban checkpoints.