No need to discuss, this topic has been beaten to death with at least a couple new threads per day about it. There's at least one thread where Supercell staff has commented that it's not easy to implement among other issues.
And you say "This won't hurt the longevity of the game, or super cell's profits (for selling gems)" - oh YES it WILL hurt SC's profits!! TONS of people gem the completion of their heroes in order to use them in a war. If this idea is implemented, all of those gem spenders will stop spending gems on finishing heroes.



