Where did i provided solutions?
Your answer was you think it will affect other people and you can’t just simply pick somebody else from a hat that didn’t dungeon boost or shun other people who did the dungeon boost and we have to remove this from the game? 
Well you cared enough to give arguments on why you think dungeon boosting is bad and went on about the cause and effect. So i don’t know why your following it up with a pointless “i don’t care”. (i’m not saying that to insult you, i’m saying that saying that will achieve the opposite effect, showing that you do care. If you truly don’t care, you wouldn’t have replied.)
Now, if your reason that dungeon boosting is bad cause you sometimes pay real money, or always, then yea, i’m up to ban the real money trading, cause the person doing so will get their account stolen. And can understand the comparisons to Microtransactions. But if it’s just some guy taking one guy though a dungeon for trading gold for about… 6 - 12 hours or more to grind for XP, and they will become bad, i don’t still see the issue here, even seeing all the arguments put though, considering this is still Classic.
Also, are we going to imply here that the only way to learn your class is to just level up with it? That person who boosted can also just look up basic guides or figure out on their own what to do, they’re not denied from learning their class just because they had another high level cleared the dungeons for them. Would i recommend them to PvP and Raid right away after they reach level 60? Now that’s a question you should answer by choosing to have them in your group or not. But personally, no; gear up and play a bit first.
Heck, instead of shunning those players, why not help those players get better? this is a community social game is it not? 