Let me get this straight, your only suggestion to fix the issue with a faction that blobs, is to change the veteran rate of a mid/late game unit for that factions advantage, and rely on the good will of the OKW players who blob and shrek spam, to use the 100 munitions elsewhere.
Pretty sure I recall many Allied advocates saying that they wouldn't abuse the hell out of artillery pieces like incendiary smoke and incendiary firebomb-strike so much if they had more sinks for their munitions.
It's less about good will and more about what tools the OKW has. Almost all of their offmap artillery has been nerfed into the ground, they don't have bunkers and FlaKvierling emplacements cost fuel and manpower, not munitions.
The only upgrades they can spend on are pintle mounted MG on vehicles (relatively few) mine-sweeper kits for Sturmpioneers, and of course weapons for doctrine specific units like the Panzer Fusilliers and the Infrared STG-44. They don't have many mines that aren't doctrinal. So of course the panzershrek being 90 or less muni with bulletins is going to be the most cost effective anti-vehicle option. Most other options take a bit too long or cost too much for little effect and delay their late game panther or king tiger which they rely upon.
I think if they purchase the Stuka zu Fuss often enough, then spending 100-muni on an ability that is a useful tool while also draining muni that would otherwise be spent on Panzershreks.
It's better out of the box thinking than your attempt at trolling is bringing to the table, and it's more constructive than saying "remove the panzershrek, nerf volks hard!"