For what little we play, those of us in higher ranks, we don´t need more speed.
Now you ask yourself: why do the “pro” not play or play so little? and I say , we play little because we all take care of each other. And because? Well, one of the features on this update is OP items cause a lot of damage and the best ones are quite difficult to obtain, like legendary HP plates or the legendary resistances.
Difficulty to obtain good items imbalances the game very much. So, if you implement speed x2, people are not going to play anymore because of that, we will continue to take care of each other.
What you should do, is open a little more your hand and release OP items, so that we can all compete in equal conditions. If you increase the drop rate of these items you can kill several birds with one stone, but you will also see that people start playing a lot of more, and the pairing works as it should.