Will they give Metroid the same kind of investment they gave Zelda though? Plus recent entries like Other M and Federation Force suggest they don't even know what made Metroid a great series anymore.

My bad, I did overlook that one. But there is a big difference between just remaking an existing game for 3DS and crafting a brand new one to Switch standards.

I don't have a good grasp on game design and budgets, but I feel they should go strong with this one. Metroids fans have waited long for this, so they should go strong with this as a great return to the series.

Let me start by saying I disagree with the calculations in the OP. There's no way Breath of the Wild's budget was $60M, let alone up to $96M. I'd say it was $40M max, but possibly even closer to $20M. So I expect Metroid's budget to be less than $20M.

....But you asked what I would I. I would definitely spend more. I'd say around $30M. I've always thought that Nintendo should spend more on their games, but as mentioned, they are indeed very cost efficient, so that's why my recommendation is still a modest one.

35 Million. There's still demand for FPS games, and even more so for story driven games. Horizon ZD, Uncharted 4 and God of War proves that.

Game Dev - $35M
Bribing Reviewers - $5M
Marketing $10M

Create limited edition game and console

This is Metroid's time to shine; with so many franchises selling better than ever before on the Switch, this is Nintendo's chance to make it a premiere series.

But for that to happen, they need to go all in, and give it the same kind of spared-no-expense treatment that games like BOTW and Odyssey benefited from.

The equivalent amount to make it profit after selling at least a million copies.

I can understand your point but budget and maturity are nut necessarily linked.

20 million or less. They don't have to go for next gen graphics, like Sony and MS do.