Lets take a look to the current state on healers after orkham patch and corruption system. Be honest, only 2 healer class combination is alive, you know which ones. Yes, i agree with lutine's post above, earlier, crossbow gave not bad advantage over others, but i could make up for it with something else in my class(of course not all classes were suitable for it). Now all another healers is trash(very sorry), because buff 800k atk better, than my ~600k, but i have +5% all attributes buff for raid, although there are many worthy healers. If dont touch the crossbow, then i see such solutions:
1) Boost another buffs (for example you give ~700k atk + something elite skill which give for example 6% atk more, i wrote about change priest/rogue, i think not bad solution. And in druid/bard's crocodile looks very good xd)2) Buff formula needs in correction, need add more components(for example passive skills on wisdom), at the same time weakening the influence of unbuffed wisdom.
Until something is done about it, i not see reason write something about changes in healers, because we have absolute answer: priest/scout and druid/scout.
yes, I guess a more or less easy solution would be the change of the buff formula in a way like:
depending on 1.5 x you heal bonus + 0.4 x your wisdom (buffed values). Maybe this should be around the current buff state (cannot check ingame atm, but I think something in that way, that heal bonus is not totally useless in the formula, but also buffed wisdom values, that other heal classes are not trash bcs most heal classes have additional wisdom buffs except p/s and d/s, which is the best quick win solution I think
Need take my calculator and a little statistics.
1) Lets check heal points or heal bonus. In average healer have ~110k (may more or less, depend on class). its 110k*1,5 = 165k. Heal points very tight, i think 2x modifier better, bcs get boost for heal points very hard (mb impossible, bcs very few that it boosts). We can get 220k atk from heal points.
2) I think only buffed wisdom bad idea and not buffed also. Better combination buffed + not buffed. In average healer have ~300k not buffed and i think ~1m buffed wisdom. Such combination: 300k*0,3 + 1m*0,2 = 290k atk
3) Right now i see confrontation 1h and 2h stick. i would like to include magical damage in formula. In average 2h stick have ~1,5x more magical damage, than 1h. I think so: if 2h he got 2,5x modifier its ~75k if 1h he got 4x modifier its ~80k. i think ok, bcs 2h have more +% wis, than 1h.
In total we have: ~600k atk