It's an interesting situation.
Bethesda is doing what it typically takes to build an audience on a platform: they're releasing a number of their games and greenlighting other games before their first games aren't even out. They probably don't care all that much what the initial sales of the first ports are because their long term strategy is actually to build an audience for their games. There are no tests, they see the first games as investments. Investments that probably will make them some profit, sure, but not as much as on other platforms and that's okay, because it is a long term investment.
The thing is, Bethesda is the only western third party doing this on Nintendo platforms. All of the other third parties did this last gen on the PS3 and 360, which is how they're capitalizing so heavily on those investments this gen. But nobody else seems interested in actually going through this process besides Bethesda.
So even if, eventually, Doom Eternal or Doom Eternaler or whatever iteration does sell extremely well, potentially better than on some other platforms, that won't necessarily be the wake up call for other third parties that we want it to be, since they still won't have actively tried to build an audience for their games.