Bethesda says that all of their games on Switch have been "hugely popular".

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Darwinianevolution said:
Now I want to see which version of Doom Eternal will sell better: the one on the Switch or the one on the XBOne?

I can imagine they will be tied at the very least. It'll arrive the same day and the hype around Bethesda supporting the Switch allows for more media coverage. It will at the very least hit 1m most likely, which is really all we can hope for. The install base will be huge after this holiday with Smash and Pokemon, and next year will also be huge for the Switch.