@MasonADC: If they continue with the development philosophy and resources they have now as hardware get's more and more advanced, then it's not a matter of if, but when.
@RolStoppable: Sword/Shield, regardless of whether people enjoy it or not or think it's a good game or not, has various technical and programming flaws that cannot be overlooked or denied. If this is happening on the Switch, how much worse could it potentially be when Nintendo's next system comes out? Or the one after that? If this trend continues, with Game Freak and TPC continuing to maintain their small dev team and resources, which will become more and more limited and dated as the technology and power grows (for Nintendo's standards anyways), the "Sonic '06" of Pokemon will not only be likely, but inevitable.
The Sonic 06 moment being inevitable is a very overdramatic statement. Sword/Shield is the first 3D mainline Pokémon with a free camera, so it posed a bigger challenge than future games will. Insufficient planning led to time constraints, so some aspects of the graphics (like the often mentioned trees) couldn't be properly finished because other things were more important. I doubt that GameFreak will just sit there and decide to do the same thing again for the next game.
Additionally, Nintendo's corporate goal puts the value of their IPs at the center, so they'll keep an eye on execution and reception of their IPs, and reception means more than just sales alone. I don't think Nintendo will neglect Pokémon to the point of a freefall into Sonic 06 territory. If GameFreak can't solve the deficiencies in the graphics like the pop-ins themselves, then they are going to get help to focus on gameplay and content.