There's a chance that after Pokemon, Nintendo will release number 2 of all its first party titles again, then third party will move away from them making next-gen games for the home consoles, then they will get to draughts until next system.
I think what's far more likely is More unique games and series from the handhelds. As for third parties, the Switch won't be as left out as you think.AAA games are becoming fewer and fewer each generation due to how expensive they are to make now. Not to mention, 8th gen consoles will continue to be supported for quite a while after 9th gen since they already have a built-in audience and are still very easy for smaller teams to support. So the Switch will continue to get most of everything that's not AAA.