Number 2 is out of the question. There is absolutely zero chance that Ninty releases Switch-family hardware that is statistically equivalent to PSbone before those guys move into their next generation.
Number 1...... Streaming does not seem to be ready for prime time just yet. But, in theory, something like this may happen over the next several years. I'm not holding my breath though.
Number 3 seems reasonable at first glance. I think it would be something more along the lines of Nintendo buying the code and Switch rights for various games. But, I am not aware of any of the hardware guys ever doing this before. I'd have to bet against it.
I'd like to offer an option number 4 - The Switch install base grows to such a point that third party publishers just cannot skip the system for business reasons.