Zelda has far broader appeal (the worse selling mainline Zelda games still sold more than the best selling Metroid game) and much more freedom unlike Metroid plus no one ever said Xenoblade would never sell 1m the first game nearly did with a limited release you're going to have to link those who said that. Metroid requires far more from the players taste than these games and has since the NES days. Zelda is an adventure series with the recent game going massive open world with sand box mechanics BOTW even dropped focus on dungeons some Zelda fans are unsure about, Xenoblade is an open world JRPG with an in depth battle system that's easy to get into, Metroid is it's own niche in the industry to the point its its own genre along with Castlevania the latter of which has even been shelved by Konami due to its limited appeal which is the result of require such an advance taste to get into.
Past sales are not the limit for future potential, countless franchises have demonstrated this. But we're never going to agree, so we'll just have to wait and see.
Yeah, but you cant ignore it either, because the sales history do show a pattern that can be studied to thus predict possible future outcomes.The only case which sales history might become less relevant is when the game in question tries for something entirely new, which is the case of Zelda, Mario(Kind of), and GOW, to give an example from a different platform.
You could say that a desirable hardware might unlock a game selling potential, which is indeed true in this case, and thus justify a higher budget for said game.The problem here is that MP 4 started development before the Switch released, and Nintendo was still unsure about the Switch doing gangbusters, and so being cautious about how much they were willing to spend on their games.Maybe given the runaway success of the console, Nintendo might have, sometime during 2017, given an extra budget to whoever is developing the game to hire additional personel to polish the game further, maybe even enhance some assets or key scenes, but MP 4 will be "held back" by being a game concotioned in the "pre-Switch era", in terms of when the development began.If Nintendo was being cautious about it, anyway.
And I mean, its not like Nintendo will not give it the appropriate budget either.Nintendo is very efficient with its money, and they know that the Prime series requires a good budget due to the nature of the game, so I dont think we should worry that much.