For an equal talent in a frontcourt player I'd be open to a Trent trade.
OG not so much.
The issue with trading Trent is that you take away one of the team's best shooters, and the guy that often times Siakam and/or VanVleet need out there to create space and flexibility. I loves me some OG and Scottie, but the reality is that right now neither of them is dangerous enough as a shooter to create any sort of gravity to pull the defence to them. Trent might not be Steph Curry, but he at least has to be respected at all times.
If you trade him for a frontcourt guy, by which I assume you mean an interior frontcourt guy to take some of the pressure off of the Birch/Achiuwa/Boucher triumvirate, you're taking away a floor spacer/gunner and putting more pressure on a Raptors perimeter unit that just doesn't shoot it well enough as a group to maximize their talent.
Agree that OG isn't going anywhere short of some team offering up a franchise-altering player in return. And no, Myles Turner is not anywhere near that category of player.
Other problem for the Raptors is that they are butting up against the luxury tax and have made it known they don't intend to pay over that threshold. The unfortunate issue with the Dragic gamble is that there simply aren't teams out there with the cap space or trade exceptions to swallow his deal enough to make it valuable without taking back buckets of probably bad money in return (short of the Raptors paying a bad team with cap space to absorb the deal, but there's no benefit to Toronto to need to work out that kind of payoff), and Dragic is in a position to force the Raptors to maximize his buyout payoff if they want to just jettison him, which doesn't offer a ton of cap relief.
So the unfortunate scenario for the Raptors is that they pretty much have 1 workable asset to bring to the table: Boucher and his $7m expiring deal. Plus maybe Bonga's $1.76m as ballast.