Since we are talking real world, not game stats, I have to disagree. The MG-42 was a really good machinegun, so good that its still used with only minor changes (MG-3) with a lot of todays armies.
It would certainly seem like that, but I'd be hardly surprised if the decisive unpopularity of basically all matters military in Germany wouldn't have affected the decision (they're real touchy over the whole Nazi invasion things). Probably a lot cheaper keeping basically the same machine-gun with minor changes than making a new one (though they have now adopted the MG4 in the SAW role).
'Course, so have the 'Muricans with still using the M2HB for about a few decades short of a century, but they did attempt to develop replacements that were later canceled.
Because it's the worst MG in the game and is not worth the MP, maybe if the gun costed 160MP your argument would hold water but it doesn't.
The current patch MG34 is about as much use as a chocolate fireguard when it comes to countering con/rifle blobs.
It's an HMG42 with less single-target suppression, almost no difference in AoE suppression, less DPS, and the potential for vet 5. If it needs to be any cheaper, it's not going to be by much.