Or you can look at it this way:
You still have basic infantry that scales well, but isn't independent of other squads(volks theme fulfilled early game).
You have a cost which prevents spam and encourages you to actually use supporting units in all stages of the game, I gave random number for the cost, but the main idea is to increase it enough to make volkspam only builds still an option, but not a no brainer choice introducing basically something they lack-a disadvantage.
You have a unit that scales thanks to upgrades(both AT and AI, so your point about them being "remotely useful" past 5 mins is completely moot), making it live up to the cost and be more independent in mid/late game. God forbid you have to actually manage your muni instead of pumping it all mindlessly into shrecks! If USF is able to deck their squads with 120mun per squad while using other upgrades and abilities, so is OKW capable of equipping multiple 90mun upgrades, which already is proven to work with volks+fusiliers builds and there is no problem with it.
So... get a bigger picture.
The Problem is that you would need to pay 280-300mp (or just a random amount of more mp for that matter) for the same vanilla Volks we have now. And you would need to pay actual munitions with 80% mun income to make them remotely useful after 5 mins. My argument isnt moot here. I said that you would need to pay munitions for them to scale. Which is kinda fine on its own. But, paying 280mp vor vanilla volks? No. Its like giving a huge nerf to OKW they dont need. Because Schreck Blobbing is such a huge issue nowadays. I havent seen it for ages, literally.
But god forbid, dont change USF, which have Riflemen actually worth the initial 280mp cost. I wouldnt want to pay 280mp in the early game to see my Volks struggling vs Cons.
Your change wouldnt fix blobbing, it would just hurt OKW even more. I suggest to play the damn game, especially 1v1 as OKW. See how much success you'll have and rethink this stupid mp change.