Gov'ts are designed for slow change. The advantage of this being that it should avoid massive populism to dismantle everything in one go (imagine if the Tea Party had control of the Senate). There are movements both in the judicial and the legislative branches to start pulling back the excesses of the executive.
Sure, Obama could "executive order" everything away, but why would the executive neuter itself? Luckily checks and balances are a thing, and we're fixing this.