Ash will still have the highest pick rate as long as "Dash" is exclusive to her. Nothing will change in this regard. We'll be seeing less of Ballistic and Alter (I think), but Ash will still always be in every game.
Dash has killed the variety of legends picks in this game.
Not to mention that this adds so much movement to the game, speeding it up so much that pubs usually end in the second or third round. Before you can find anything, half the squads have already been eliminated.
15% less damage doesn't mean anything at all with the current low TTK, where with such a hitbox you can take down Caustic with one R-99 or CAR magazine.
Unfortunately, if Respawn wants to maintain any balance in this game, they still have a lot of work ahead of them, and they need to understand exactly where they went wrong.
Reading Reddit, when the developers were answering people's questions, it was clear they were very proud of the Ash they had created. They were in a different world, as they didn't play their own game and didn't understand how this change had such a negative impact on many aspects of it.
By making Ash the way some people are writing, they added some "fun" while ruining many other game mechanics. In summary, this change brought more disadvantages than advantages.