Despite the performance issues and other flaws, I still think S/V were a step in the right direction for the series, with the open world format being a rare step forward that made the game enjoyable despite its problems. If GF had more time to work out its kinks, and make more than a handful of the boss fights actually difficult, it could've been a top-tier entry in the series, but as it is it's still the best Pokemon game of the last 3 generations. Black and White should never be touched, they hold up to this day (even in terms of graphics; the unique aesthetics of the generation make it look good in spite of the DS' limited hardware capabilities) and as you said, Game Freak would just sell it out to a 3rd party and they'd fuck it up, just like BD/SP. GF has arguably never been good at remakes, but I'm certain they'll never top even their better ones like HG/SS or OR/AS.