Oh no, so Metroid Prime 4 might sell 4 million instead of 5 million.
Nintendo's main focus is on Switch 2 now and delivering a platform that can see them through the next 8 years of software sales. Having an incredible year 1 (like Switch 1 had) is way more important to them.
Switch 2 was supposed to come this year and they released an actual megaton last holiday with Wonder. Had Switch 2 not been delayed, I'd bet they'd have something that we all think makes a lot of sense to be cross gen just before Switch 2 released.
They could've repurposed some of 3DS' late life games as Switch cross gen titles but didn't, and Switch isn't compatible with 3DS, a problem Switch 2 won't have.
They had the absolute biggest release of the 3DS in November 2016 with Switch releasing 4 months after it. They also only revealed the Switch in October of that year, and Pokémon Sun/Moon(or hell even Paper Mario Color Splash) probably played a factor on it. They still absolutely wanted to sell software that holiday season, and they saved an unannounced Wii U game that could literally just be sat for a little while and be even a Switch only game to release that October.
They were expecting to sell some huge volumes of software this holiday and that will already be hurt by the main title(3D Mario, presumably) being delayed. They will definitely have stuff to sell on the period of the year that they sell the most.
That doesn't necessarily have to be Metroid Prime 4. It can be a 10m selling game if they choose to release Mario Party this year. Or a game that we can't determine the full sales potential but can very well turn into a 10m seller with Donkey Kong. Or they can just split and release more games that sell less than that, like FE4, MP4 and a 2D Zelda or the remasters.
What they absolutely don't need to do is pack the next year which probably already is set with some real big stuff exclusive for Switch 2(Mario and Mario Kart), cross gen stuff that was already meant to come in 2025(Pokémon, maybe 2D Zelda or DK or remasters) and niche stuff that will fill the voids that something like MP4 would if it came this year as cross gen.
I believe Metroid Prime 4 can again a lot with the spotlight of being a launch window title for Switch 2, and I think it could make the franchise reach new highs, but I don't think being positioned as THE holiday game(like Dread was) on a year that's way quieter than 2021 will do it any harm either. I believe both occasions have their pros and cons, and I think Nintendo's marketing department will know better when to release it. But I think Switch 2 lineup of 2025 is more than safe and can be just as great or greater than Switch 1 even if all of DK, MP4 and Mario Party come in 2024. And definitely they won't save Fire Emblem 4 remake for next gen, for all we know they can have a brand new FE game for Switch 2 by early 2026.