Right now, the A's are a bad team but they're also a team missing 80% of their starting rotation. Even at full strength, though, Oakland stumbled through bullpen disasters, defensive breakdowns, and at the end of the year they will have pretty much been a 90-loss team from wire to wire.
Does that mean you can't expect the team to win 90 in 2016, because a jump of 20 games is unrealistic? I'm not suggesting the 2016 A's will win the AL West or compete hard for a post-season bid, but I also don't think it's especially hard to see it happening.