Roquan is a piece, and he's in his prime. You will need talent to win in the NFL, so I say lock the boy down. I understand if he wants astronomical money though not doing so. If not, maybe you don't value the weakside LB role too much, trade him for a very legit WR. Maybe that's what you need to get better. If you trade him for draft picks, it says we are planning to suck this year. And it's banking on Poles ability to draft, and likely you get a player of lesser quality than Roquan.
Or Poles drafts again without a focus on developing Fields, giving him support. Let's say he takes "best player available" (which flies in the face of valuing or not valuing weakside LB). If he continues to flesh out areas not directly helping Fields, then in my opinion our window of success moves down the line. You need a good QB to win in this league, so invest in that. Its pure hubris to think you are doing it without a good QB, see: Bill Belichick the year after Brady.
It's a fine balance to "tank". You have to be certain tanking is not just some false hope. I sure hope Poles is in communication with Eberflus, and he has a clear idea what weapons he needs to make his defense sing. Because if we let Roquan go for a 3rd rounder... I think convincing this fanbase you're making a net positive move here is going to be tough