I played Dash/Corran throughout store champs. Having practiced quite a bit against autothrusters I have moved away since wave 6 launch. The obstacles might help make up some of that gap, but I doubt Dash/Corran will be a big contender in regionals.
I kind of feel like Dash/something should be notable in the regionals, at least these regionals, just because three big debris fields are going to throw people off their game in some way. Maybe it's only enough for some cheap wins in Swiss, I don't know, but it seems like people aren't going to have a good handle on how to fly around them, and Dash just does not care one bit.