SEV DEMO IS OUT!

[Suicide Junkie]

There is no longer infinite supply generation.

And, of course there is no reason why you can't add a generation ability to bases. Solar panels work well.

99% of the time, bases will have plenty of supplies and ordnance stored anyways... the only time they wouldn't is if the enemy lays siege to them, in which case the limited supply is a feature.
Throwing enough cannon fodder at your bases that they run out of ammo is a VERY expensive way to win a battle.