This is a good thing if he's used correctly. Markakis essentially replaces Matt Adams. Instead of using Ozuna in left and Adams as the DH against right handers, you use Markakis in left and leave Ozuna as the full time DH.
Not sure why you'd look to do that just yet - we appear to have stumbled onto one of Adams' famous hot streaks. No reason to turn him into a PH until he goes cold.