@killer7 The problem with comparing the DS/3DS transition to the Switch/Switch 2 transition is that the 3DS was a much less successful system than the DS. As a result, it made sense for GF to prioritize the DS more than the 3DS. They jumped ship from 3DS to Switch pretty quickly because the Switch proved early on to be a huge success. They even seemed eager to jump off the GBA and get to the DS quickly (FRLG & Emerald launched less than a year apart and DP was originally slated for 2005).
Obviously we don't know for sure what will happen with the Switch/Switch 2 transition, but while I feel like Switch 2 will sell less than Switch 1, I still see it being a raging success. As a result, I can't see there being any major titles for Switch released after 2025. Just some remakes, ports, remasters, etc. (and even that would probably end by the 10th anniversary of Switch). I don't expect Switch 1 to sell a lot after Switch 2 releases (maybe somewhere close to 5 million).