Nah. I am sure they will launch a New Switch in 2-3 years, though, with an upgraded chipset. Maybe a 1080p screen. Definitely not going to be 4K, but it should at least run everything in 900p or 1080p if it can only do 720p in HH mode on the base unit. And it should be able to do everything in 1080p in docked mode, with smoother framerates.
If Nintendo sticks to HHs/hybrids, like I think they should, than you still have 2-3 more gens to go before they can output 4K visuals that look much better than the Switch.