I don't understand why people think we need to upgrade at SF. Crowder is almost necessarily a part of our long-term future because he's a starting caliber player who only takes up about 5% of the total cap.
It's because he's been playing way better as of late. Last year he could hold his own against mediocre and bad teams, but would get murdered by anybody really good. Now, he can mostly hold his own, so people are undervaluing him.
HOWEVER, SF is by far the most stacked position in the league. Kawhi, Durant, LeBron, George and Melo are all clearly better than he is. Then there is a group of Gallinari, Greek Freak and Hayward who are definitely better and still haven't reached their full potential, but are not as good as the first group. Then there is Crowder, DeMarre Carroll, Rudy Gay, Batum, Will Barton, CJ Miles, Kent Bazemore, Tobias Harris and Evan Fournier. Now, where does Crowder rank in that third group? Like 3rd? He's only 24, but he'll never even make it to the second group's level. If we had Gallinari, he'd be the best player on our team.