everything up till jackson/su-85/panther/jagd4/firefly/comet/churchill +doc heavies will go like normal wouldn't it?
m4's,pz4's/t-34's/cromwells etc come out as normal, you could wait to get enough fuel for your su-85, but it would be more advisable to get out a t34s/su-76's.
example if you play sov vs OST: you got your cons/penals/mg's/zis-3's, do you get a t34 for 90 fuel, or wait for su-85 150-160 fuel?
same for OST, do you get pz4 for 120 fuel, or wait for panther 210-220 fuel?
making a TD wall would now have a huge tradeoff in price, and encourage more active playstyle, and use more mediums for pushes, and not going for the no-brainer td-wall of the meta
add some doc meds to tech tree for more variation
buff's/nerf's gotta be handed out here and there of course
What this would actually do is encourage turtling behind AT gun walls for all factions because you've taken away the mobile "active" alternative.