Please for the love of god remove them!
I play all classes, so I'm not saying this just because i'm tired of only being invited to world boss runs for summons (which has happened) So let me explain. The way I remember it, lock summons were only really a convenient thing to have if, say you had to replace someone in a raid, from the time I first started raiding, all the way up until MoP. Maybe it was the popularity of Destro locks in MoP, or maybe people are just getting lazier. Like i said, i play all classes, so I do Kazzak 12 times a week (i have 2 locks, one horde, one ally), and I try to be at least in Tanaan by the time I sign up. But the number of people who sign up in their garrisons and expect a summon, sometimes leaving if they can't get a summon immediately, is ridiculous. I actually got kicked from a group earlier on my gnome because i was already there, with 8-10 other people in a full raid, and when i dropped the stone, no one would help summon, so i stopped trying and the leader booted me because he wasn't even there. So for me, there are 2 reasons locks shouldn't have summons. Makes people even lazier than they already are, and there's no lore reason why locks have the ability to summon, so people can't get mad at removing it for that reason.