There is merit to competition in and of itself, but there are now far too many venues that offer little to nothing that's truly different or innovative. The result is a more fragmented, complex market that is easier for HFT's to game, not to mention the ever-growing spam of mostly-useless data onto the OPRA feed.
Markets function best when a large number of buyers and sellers are in the same place at the same time, and this undermined by the profusion of contracts (strikes and expiration dates have soared) and exchanges in the options market today. The result is far more slippage/spread for the end-user, liquidity-taking trader.