I quite enjoyed Breakout, really nice change of pace from standard arena. It definitely needed a few tweaks though.
I think making it pistol only starts would be pretty good. The pistol is skillful but also doesn't have enough range to cause a match to devolve into a game of long range pot shots. Having BR starts would be terrible with Breakout, having BRs on the map at all was pretty bad. I think placing SMGs on the map as pickups would work reasonably well.
Josh has also talked a few times about adding an objective. That would definitely help a lot with the stalemates which occassionally happened.
I don't think reviving would be good at all though. It seems very much counter to entire basis of Breakout. It's elimination, when you're dead you're out, make a single mistake and there's no second chances. I think with revives a lot of the pressure and intensity of Breakout would be lost. The best part of Breakout was winning coming back from being 3 guys down. Revives would ruin that because the objective would turn from carefully taking the enemy team down one by one to quickly finding a teammate to revive as quick as possible.