My suggestion: cheap. Not as in it looks cheap or feels or it anything, but is literally cheap to make compared to those other IP's you listed.
Pikmin - console IP which they feel needs to evolve as graphics evolve if Pikmin 3 is anything to go by. Miyamoto is holding it pretty close to his chest too which probably stops it from expanding.
Star Fox - Nintendo are convinced this cannot exist as a rail shooter and to expand it to anything beyond that is going to take vastly more resources.
F-Zero - has always been a decent looker and pushed a solid FPS, which again takes technical work which is more time consuming. I suppose they could revive it as a handheld IP but it feels much more like a console IP.
Yoshi, however, I have no idea about.
I think Rol's suggestion is the main reason, though.
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