Really, the fact that you're heavily incentivised to lose squads as OKW is my biggest gripe with the faction at the moment. Rather than just being fairly weak infantry with no particular role: Volks really should get a very concrete role/upgrade path, and Obers really should arrive soon enough that they can actually fill infantry slots, rather than almost mandatorily requiring that you lose a Volk at some point in order to replace them with an Ober. I honestly don't see any reason you shouldn't be able to build Obers after the first truck (at a lower power level, obviously).
Incidentally; If the argument is that it doesn't matter if one CQC squad wins against another, I would have to assume that buffing MP40 Volks so that they walk all over PPSH cons wouldn't be something anyone would have a problem with.
I'd say the problem is not incentivising losing volks, but over spamming them, not taking into account their late game performance into the first place.
1v1 high level will always be a different can of worms, but its not exactly hard to get 1 volk less, 1 kubel instead for map control and replace it later with ober or other elite inf of choice when it outlives its usefulness in any other game mode.