In fact the Nintendo Switch already has an addon that allows you to play your games on the television. That's right, the Nintendo Switch dock can be considered an addon to the Nintendo Switch, and even though it currently doesn't add any sort of power enhancement at this time, Nintendo could release a version that does.
Nintendo has stated that the Nintendo Switch can deliver some 4K gameplay at 30 fps, it can't do it for all games. Well a Nintendo Switch Dock addon with additional hardware could turn this already great console into a true 4K gaming beast.
What would be needed in the addon would be;
- An additional CPU
- An additional GPU
- Additional Memory
As for the price of such an expansion, I'd estimate a retail $200 to $300, which does see kind of expensive as you have to add the Nintendo Switch price on top of that. If you consider that fact that the Switch is also a portable, it'll be similar in price to buying a portable console and a home console which some people already do.