To be honest, I have BA models that I'm playing as various flavours of Vanilla. I really enjoy Ultramarines. I found I could play a more successful "assault focused" army with UM than I could with BA. For really-reals.
I myself have only heard rumours, but if you're considering putting the BA codex in the bin and switching to... any other... MEQ codex, I'd say go for it. The RG formation could require that you wear an eyepatch over your good eye, stand on one foot, and roll your dice into a shallow bowl of soup, and you'd still have a better time then playing with the BA codex.
The assault from reserves, if within range of Scouts, would only really be helpful if someone was close to your scouts on the turn they dropped... so you'd kind of not want to drop them on turn 1. Chances are good there wouldn't be anyone to assault. So now you run into a situation where you're putting at least
a third of your army into reserve, hoping someone moves close enough to your Scouts that you can take advantage of the rules. Deep Striking assault units that can't assault when they drop have not been very successful in 6th / 7th, in my opinion.
Of course, you could take 500 points of Scouts, to spread all around the board, but now you're spending 500 points on Scouts... not a typically game winning option.
Further, many armies are getting buffs to their overwatch. Dark Angels, Tau. Maybe IG when they roll around. Because that needs to be a thing. Grrr. Anyhow, while DS into Assault seems powerful, I don't think anyone has "broken" it at the tournament scene.