There are skills in many mmo's that are not broken, but are so frustrating to play against that they are perceived as broken. In many games it's the stealth mechanic.
I think bolt escape fits into that category.
Running away, a lot, is certainly not winning. The only thing I can see that was truly "OP" about bolt escape is running with a scroll. In capture the flag if you are faster than everyone else while you carry the flag it's probably broken....
So I would have argued that increased cost of bolt escape while carrying the scroll was warranted.
Otherwise, I don't think we have enough data.
What zos should have done with the bolt escape nerf, or with any nerf, is explain the numbers. They can data mine the game for numbers that we don't have. They should give us the trends to explain any nerf or buff. Were sorcerers with bolt escape winning an inordinate number of their encounters? Was the number of sorcerer deaths disproportionally low? And before someone jumps in with all the sorcerers that got away-that's not data, that's anecdotal.
Give us the logic behind the change or we will assume that flaming in the forums will cause change. I like this game, but if forum flaming alone can cause changes it won't last long.
Zos, please do a better job explaining the trends that cause you to make changes. We don't need specific numbers, just tell us what you see and how the change will fix it. There will always be angry players, but many of us are reasonable people and a little explanation will go a long way.