With the new Spider-Man set coming out I could not be less excited. I'll pick through it to see if there's anything that sparks my interest but I have no intention of playing at the pre-release or buying packs.
And the question came up from MaRo himself "is there anything that can happen with the Universes Beyond product where you accept it's had a positive effect on Magic as a whole?"
The answer to that is: I can hold two thoughts at once.
The sales of Universes Beyond apparently demonstrate more people are getting into the game. I say "apparently" because I've never seen anyone cite numbers-either for or against. They certainly are selling. Hasbro posts profits and the signs point to Magic being an important brand. That is a net good, if you love the game.
Which doesn't change the fact that the product is also predatory because it's priced higher than regular product, creates a second reserve list, where if people don't buy into product they don't want right now because of the theme (not the mechanics), then they run the risk of never being able to see that product again, and that the Universes Beyond sets have increased the flow of Magic cards to a deluge and that feels exhausting.
Nevertheless, I would still like a Universes Within set-something like the Time Spiral or Innistrad Remastered sets. Collected editions of UB sets but printed as Magic cards in-universe. This would go a long way towards mitigating the ire that players like me have towards these outsider sets, because it would show a willingness to bring the game back to the people who have invested so much into it, or just don't want Spider-Man in their Black Lotus.