I think slowing down on first party releases is natural at the end of any generation - once dev kits are available it just makes financial sense for new games to be built on the upcoming hardware.
Will Nintendo reduce the price of the current Switch’s games? I doubt it (at least any time soon). Unlike the Wii U at the end of its lifespan, the Switch is still popular and people are still buying games like BOTW. And working on the assumption that there will be backwards compatibility, it wouldn’t be consistent with Nintendo’s strategy to reduce prices now.
I could see the new Metroid Prime being a Switch 2 launch title, and maybe they’ve been working on something like Odyssey 2 for that purpose. I doubt we’ll see another Animal Crossing or Smash game for a while.