Over the past several months, I've been working on replacing or accepting all of the data in Maryland marked as problematic by the OSM Inspector. As of today, I'm done (and I touched up DC, too, though others did most of the work there). I have looked at every problematic bit of data and either marked it clean (for mechanical edits like expanding name abbreviations), made it clean (by removing all data contributed by non-agreeing contributors), or deleted and replaced it (using only OSM-compatible data, of course). The only exceptions are standalong nodes with tags I couldn't verify remotely that had been created by a non-agreeing contributor and never touched by anyone else. Those will probably be deleted when the license change is effected, but they won't affect the surrounding data at all.
Next up is seeing what I can do to help clean up Virginia. The area next to DC is decidedly unhappy.