To all the people that are saying "You can still heal as DPS, stop whining" have clearly never raided progression content before.
Heck, even a few wrong choices on a DPS tree can lead to sub-par performance and I'm not going to (if you say you would, you ARE lying) re-roll a max level character to find out if extra crit or extra damage is the better option.
The respec option needs to have a cost cap, 10k credits is very reasonable in my opinion. I'm not sure on what the funds available to max level characters looks like, so the cost could go a little higher, but there does need to be a cap.