Wilson Combat isn’t the only one doing this.
There's a list here: http://www.thepoliceloophole.com/. (Wilson Combat isn't on the list yet, but an email has been sent to their moderator.)
One of the first to do this were LaRue and Olympic Arms, who like Wilson are makers of high end custom arms that probably aren't going to lose many LE sales since they didn't have that many to begin with.
There are a lot of others on that list that are jumping on the bandwagon, and one in particular (Cheaper than Dirtbags) trying to get back into the good graces of the shooting public.
As I said, I support the gesture, I just question those particular companies' financial impact of their decisions.