The thing with the Switch is that if Sony and Microsoft's next gen consoles do launch in 2020 or something, then by that time with the rate the Switch is selling the install base will be massive (maybe in the 50-60m range). So even if the power difference does become bigger, third parties aren't going to just completely ignore that massive user base, we're already seeing a lot of developers trying to get their games on Switch after seeing its success. Maybe it means there won't be as much multiplatform stuff, but there will probably be stuff made for the system in mind. Think stuff like Octopath Traveller. So there will still be things there.
Plus I think Nintendo probably will release a revision of the Switch at some point in the next few years like they usually do with all their handhelds which usually come with some sort of improvements in the hardware, so perhaps that will help too.
Anyways Panic Button is doing a fantastic job, they've basically become the go to studio at the moment for porting stuff to the Switch.
