I don’t think it will have a dramatic change either way, it’s kind of too weird right now to “fix” (if it’s broken, this isn’t the fix anyways). But it would, over time, start to highlight the players who raid a lot and always kill GKs - I don’t think that’s a bad measure of at least the top of the leaderboard. The bottom is a different story.
I don’t think that’s true either. At least I don’t think that the reason for making this change. I think good teams will start to be defined as the ones who kill GKs more often and have the hardest GKs to kill, which could give an advantage to some teams who may not be top ranked presently.
A really strong gk takes much more time than a barricade or a tower. Maybe 20-30 seconds for a good one?