It's a tricky one. If you completely remove the schrek and replace with faust then OKW have no infantry hard AT. That's a disaster.
thats why relic said several times in there streams, that they are not going to remove shrecks from volks.
Its changing anyway, when every truck needs an upgrade (munition cost)
Then you can choose for an early shreck or medic/repair.
At the moment the only two options for using munition is incendiary nades or schrecks.