It's not going to bomb. They can release any mediocre Pokemon game and hit insane sales targets. The fanbase is really hungry for an actual good Pokemon console game and will keep buying their crap no matter what. To be honest, I think releasing the same garbage and still making a ton of money is worse for the IP in the long run than a single bad game. It disincentivizes creative thinking and risk taking for the franchise. All the recent mainline Pokemon have been within this very narrow lane of lowest common denominator safe, familiar style. The franchise is in the state its in because they can pump out an uninspired game every year or so without any financial consequences.
I hope a different developer will be more willing to take risks and do something different with the franchise, maybe be more ambitious, add more features, and finish the game on time. Some of the side games by different developers have been really excellent.
I get why people are disappointed in the chibi toy-ified style. It can seem like a cheap cash nostalgia grab, but it can also be effective at getting players to use their imaginations if it's done well. It's not the epic adventure style a lot of people were hoping for, especially after getting disappointed by all the missed opportunities in SwSh. I'm firmly planted in the 'wait and see' camp for this remake and Legends. Not pre-ordering but not a hard no to picking it up.