If sales dropped after OMD, logic suggests that OMD was the cause of the drop, and that undoing it is likely to undo that as well. That doesn't sound at all like a stretch to me.
It's also not hard to imagine how the pre-OMD Spider-Man (competent, with MJ) would sell better than the post-OMD one (incompetent, without MJ).
We see it in the adaptations too. Two out of the last three major recent adaptations are ITSV and the Insomniac games, and they have a version of Peter that's more like the pre-OMD one (competent and with MJ). The third is MCU Spider-Man, who is halfway there (incompetent but with MJ...okay, not right now, but by the next film).