I would love this. In 4 man duty finder groups and if a healer goes down early into a boss fight, it doesn't matter how skilled the rest of the party is, you are probably not taking down the boss. With the ability to use raise, I'd be able to save us the trouble of having to reset just because one person messed up. Most people seem to agree that this isn't going to ruin tank balance. If it adds a bit of utility and doesn't really hurt anything, why not?