Well, I will counter your prediction with one of my own.
What if the next Mini Classic is going to be the GB/GBC or GBA? Imagine the library they could get on that!
What if they include an official release of Mother 3 in English much like they have included the previously unreleased StarFox 2 with the SNES mini.
I would imagine if they are to continue with these classic lines then they would go to the GB line before thinking about an N64. They can drop the "mini" from these lines and stick to recreating the original hardware shape and size since they are already pretty small.
I would like to see a GameBoy/Colour Classic next year, they can release the classic GameBoy design with 20-30 built in games. Followed by a GBA release.
They could stretch these out to 2020, maybe by then they will find a way to do an N64 mini the right way.
Or...
You know, they could launch Virtual Console on the Switch! Maybe they can release console specific controllers to add on to the Switch. They can rinse us for hundreds of $$$