Why is everybody getting so aggressive? Chill, fellow Nintendo fans.
His proposal would simply be an option, it wouldn't take anything away from those who love the Switch as a portable. No split userbase, no separate software development, just higher resolution for those who want it.
At the same time Nintendo would avoid repeating a mistake they made with the Wii: Sleeping on a new TV standard. They kept telling themselves that HD was still far off, and suddenly averybody had moved on to the competitor's HD consoles. Same story right now: 4K is nothing exotic anymore, check out any electronics store, it's the standard already. Nobody buys a sub-4K TV these days.