Redskins fans have cabin fever. The snow’s getting to them. No other team in town is good enough to distract local fans until NFL free agency begins March 17 and there’s not even a first-round pick for them to debate about. Fans are flat out bored, so naturally talk turns to quarterbacks — trade Kirk Cousins for a first- or second-rounder. Brother, if you’d trade a first-rounder for Cousins, there’s a house in Southern Maryland I’ll sell you for a million dollars. Don’t worry about no indoor plumbing. The walk from the penthouse to the outhouse, as Redskins fans learned last season, is short. Cousins is going nowhere. Oh, he says he wouldn’t mind a trade (hint, hint), but he’s fine staying in Washington (wink, wink). But the harsh truth was proven in late December when Cousins stumbled through three losses as Robert Griffin III’s insurance policy. There was nothing that showed Cousins is worth anything more than a pick in the fourth round — where he was taken in 2012. The only way Cousins leaves is if some team goes nuts after the draft and offers a high 2015 pick after failing to get a passer. Teams make lousy trades, but not many are willing to overpay for a fourth-round backup. Incoming coach Jay Gruden needs to see Cousins in minicamp before making any decisions. More likely, Gruden jettisons veteran third-stringer Rex Grossman, who’s no longer needed to mentor Griffin and Cousins.