I'd migrate it into the void left by Factor 5 and Rogue Squadron, really. Both Rogue Squadron and Star Fox were arcade space fighter shooters, but Rogue Squadron sat firmly further on the "sim" end of the spectrum (even though it's nowhere near an actual flight sim, or more sim-ish combat games like Ace Combat).
A sim-esque would allow for more complex and longer missions, possibly with RTS elements like curl-6 said.
A more complex game for the Nintendo core could be a solid million seller, and i'd argue it could sell well to the preteen market (or at least the segment of the preteen market whose parents won't let them buy Call of Duty), where you want something more badass but your parents still want you playing something kid-friendly. StarFox hits that note, but the question is how many parents don't just relent and let their preteens have the M-rated game nowadays...
Monster Hunter: pissing me off since 2010.
