At some point, you will be able to buy a Switch Lite for $99. Even when they release the successor - expect the original to be sold for at least three more years as an economical entry into the Nintendo ecosystem. The important thing for Nintendo is to use this opportunity to build long-lasting relationships with smaller studios and indie developers.
The Switch has proven that they only really need themselves, smaller publishers & indies to be successful.
In the end even if we dont see AAA -Nintendo's first-party output is enough to fulfill the needs especially supplemented by games like GolfStory, Overcooked, Stardew Valley, Hollow Knight, Human Fall Flat. Nintendo's main goal should really be to invest into helping smaller studios and indies, both in terms of marketing but also know-how, and resources.