Druid - agree
DK - agree because undead dragons turn into frost / ember wyrms
DH - agree since the DH process night react violently with the combination of the 5 flights.
Hunter - agree
Monk - disagree no reason why dracs cant use their limbs.
Mage - agree
Paladin - big disagree, dragons hold Tyr in high esteem. Would not make sense to not be the class that honor him.
Priest - disagree, if you can be a paladin u can be a priest
Rogue - agree
Shaman - agree
War - agree
Warlock - honestly depends on how dragons feel about wielding fel. I think they'd physically could be locks, unlike DHs, since they channel fel, not fuse with a demon.