It would seem to me that the main effects of the changes are increased time to take down bosses and a possible change to the main pve and pvp weapons. There will still be a few emerging weapons that will dominate. Ice breaker will still be used as a slow steady boss killer and gjallerhorn will probably still be the best all round launcher.
I've got a shed load of various scouts all maxed and sporting firefly and explosive rounds, murderous at level 28... Hope the buff makes them viable at levels above that.
I've also kept many of the legendary auto rifle hoping one day a buff would come..... Pest control matrix could be a cracker! Overall I'm happy, although peeved that last night I sharded some high rof shotties ( dead orbits) in favour of longer range ones..... Whoops as I now think faster rof and stability will be more important.