We really need to move passed the idea that Metroid Prime Remastered was some sort of commercial disaster.
MPR sold 1.36 million in the first 4 months on sale, which already makes it the best performing Metroid re-release; ahead of Trilogy, Samus Returns, Zero Mission and the NES Classic (GBA) release of the original Metroid.
In terms of new mainline games, MPR's 1.36 million total (as of June 2023, per Installbase) compares favourably to the LTD totals for much of the mainline series and it essentially guarantees that MPR will outperform Prime 2 (1.1m), Other M (1.3m), Prime 3 (1.4), and Super (1.4m); it has a shot at outperforming Fusion (1.6m) and Metroid 2 (1.7m). Odds are it'll only remain behind Metroid, Prime and Dread, and presumably Prime 4. In terms of sales comparisons across franchises, MPR might best be compared to Link's Awakening 2019, which sold far below Breath of the Wild and Tears of the Kingdom, but which still outperformed the majority of the previous Zelda releases and now stands as the fifth best-selling Zelda title in the all-time rankings (behind BotW, TotK, Twilight Princess and Ocarina of Time).
Much as there's still a fairly stable audience for classic Zelda, there's a fairly stable audience for Metroid, and much like Link's Awakening, MPR has a good shot at outperforming all but the highest selling Metroid titles. And I'd argue, despite Dread's success, Metroid is yet to have its BotW breakout simply because Dread, while excellent, was very much in the same mould as the rest of the series. Unlike BotW, Dread was neither conceived nor interpreted as a radical break with Metroid's previous gameplay structure and style. Perhaps one thing we could learn from Zelda is that franchise breakout doesn't necessarily equate into massively heightened demand for the classic gameplay style, though games in that classic style still perform well and towards the upper end of the historic sales range. Even if the classic style isn't selling stratospheric levels, it has still benefitted at least a little from Switch's success.
I'm sure Nintendo will want more from Prime 4 than MPR, but I doubt they expect explosive growth from every title on Switch (please see their pre-release AC: New Horizons sales guidance for a prime example of how conservative Nintendo still are on sales expectations). Prime 4 is also an unknown in gameplay terms, so we've no idea if there's been an attempt to radically overhaul the series nor if this will resonate with a much broader audience ala open-world Zelda. MPR is an example where some Fami members' sales expectations become divorced from reality.
While I am providing you all with this data, I will not be engaging further with the topic because I am bored of it and it is time for bed. I will not be returning to the topic on the morrow.
Please understand. bows