I look at the numerous games still coming to the PS3/360 as proof that Switch not being on par with the Xbone/PS4 isn't a big deal. If current version of games like Madden, Fifa, MLB, and NBA2k are all on the ps3/360, then performance wouldn't be the reason for these titles to skip the Switch. If the Switch gets off to a fast start, and first party titles will most certainly be the driving force early on, then third party games like Madden and NBA 2K will be there for sure. Lets not stop there though, we saw many cross gen games over the previous few years. Tomb Raider came out for the 360 and X1, and more recently came to the PS4. I think these are prime examples of the compromises developers would have to make with porting to Switch, but it should be obvious by now that its far from impossible. I watched a video where a youtuber was blasting the Switch for only having 4 GB of RAM, yes its less than the PS4/Xbone, but way more than the 512MB in the PS3/360. The minimum performance to expect is Tegra X1, and we know this chip is 2-3x as capable as the 360/PS3, consoles that received cross gen games for a couple years, and still receive sports games. Performance will not be the deciding factor on how third parties approach supporting the Switch, sales will be far more important, and its up to Nintendo and its first party software offerings to make sure Switch gets off to a fast start.
I'm not saying there wont be scenarios where publishers deem the effort to port outweigh the sales potential for the game on Switch, but if a given game has such a low sales potential on Switch, then what are the odds that the game really has much impact on the overall success of the Switch as a platform.
This all has to do with Western AAA third parties off course. Japanese developers who have focused on the 3DS and Vita will most certainly be developing for Switch. Nintendo has also come a long way with Indie developers. Even as poorly as the Wii U has sold, there are still numerous Indie titles being released on the Wii U.