Of course the Switch doesn't have the greatest 3rd party support out of the gates, the Wii U and even 3DS are responsible for that, that's not the Switch's fault. Switch was always going to start at a lower point of support because of circumstances beyond the platform's control.
What IS on the Switch is tending to sell OK-to-very good. The two notable 3rd party games the system has had as exclusive (timed or otherwise) are Octopath and Bomberman R ... both are going to be million sellers. That's not bad. FIFA is likely well past 700k, which is probably the highest FIFA in quite some while on a Nintendo system, its outsold FIFA on the PS4 in Japan. On the eShop, third party games are cleaning up, things like Rocket League, Bloodstained, Overcooked, Dead Cells, are doing great. Fortnite is doing great on the platform. Street Fighter is performing well for old ass ports, Megaman is doing really well.
If GTAV and Call of Duty were on the system they'd be million sellers IMO, probably past 2 million if it was GTAV. That shows there's a decent market here IMO. Skyrim is likely past 500k ... for a 6 year old port, again that's not bad at all. It doesn't have to be the same size as Sony/MS, Sony/MS are toast without third parties everything has to rely on them for those platforms, Nintendo does not have the same need.







