Since we're obviously aiming to be a contender, let's see the SF/PF role player situation on contending rosters. When I say contending, I refer to teams that were build to compete, even if they failed.
Players on rookie contracts not included and players making more than $25M not included. Shooting percentages from this season.
Dort: ~$17M a year for 2 more seasons, elite defender and 41% 3pt shooter.
Kenrich Williams: ~$7M for 2 more seasons, just 16mpg, 38% 3pt.
Hachimura: ~$18M for 2 more seasons, 40% 3pt shooter this season.
DFS: ~$15M the next season, good defender and 36% 3pt.
Derrick Jones Jr: ~$10M for 2 more seasons, 36% 3pt.
Batum: ~$5M next season, veteran, 43% 3pt.
McDaniels: near-identical extension to Devin's, overpaid even though he's an elite defender.
Naz Reid: will surely get 25 to 30 a year in the summer.
Brandon Clarke: ~$12M for the next 3 seasons, can't shoot, not worth the money.
Caleb Martin: ~$9M for the next 4 seasons, didn't play for Dallas, career average 35% 3pt.
Naji Marshall: ~$9M for the next 3 seasons, poor shooter.
PJ Washington: ~$14M next season, 38% 3pt shooter and the team's enforcer, would be great for us.
O'Neale: ~$10M for the next 3 seasons, 40% 3pt.
Oubre: ~$8M next season, 29% 3pt.
SlowMo: ~$9M for the next two seasons, non-shooter.
Highsmisth: ~$5M the next season. 38% 3pt.
Portis: ~$13M the next season, 36% 3pt.
Toppin: ~$15M for the next 3 seasons, 36% 3pt shooter.
Josh Hart: ~$20M for the next 3 seasons, 33% 3pt shooter.
Hauser: ~$12M for the next 3 seasons, 41% 3pt shooter.
Hunter: ~$23M for the next 2 seasons, 43% 3pt shooter.
Strus: ~$15M for the next 2 seasons, 38% 3pt shooter.
Okoro: ~$11M for the next 2 seasons, 37% 3pt shooter.
I know that just listing 3pt percentages without volume is superficial and obviously a lot of these players aren't great defenders, but what was the point I was trying to make?
That even though there are quite a few bad defenders in there, there are just a few non-shooters around the league at SF/PF positions playing limited roles for contenders.
Unless you're a high end starter even without a jumpshot, you're not getting on a contending roster.
The only exceptions are players like SlowMo who are great playmakers for their size (which Jeremy isn't), or athletic freaks who can play as backup bigs even though they're undersized (which Jeremy can't).
There are some more wings on minimum deals, but that's just cir stantial.
Also, have in mind that all of these contracts were signed before the new CBA, a lot of them wouldn't have been so generous with current rules.
TL;DR
Jeremy is absolutely not worth more than ~$10M a year with his current skillset and the lack of improvement in his offensive game means that offering him more based on his potential would be idiotic because it seems that he reached his ceiling early.