Ok, well if u dont think it will change the competitive environment think again. Tyranitar gets Aqua Tail. making it somewhat uncounterable now that Gliscor and Hippowdon can Be OHKO'd after a DD or two. Lucario gets ice punch, not as big since it will have to let go of crunch so dusknoir can wall it.
Salamence with outrage isnt as great as it seems, Dragon claw will still be the first option IMO. more clerics with heal bell brign learnt my more pokemon.
Azelf will gain some useful physical attack options including zen headbutt and the punches. the little **** will become unpredictable and a great mix sweeper
Gliscor can be OHKOed with Ice beam without any DDs, and Hippo can be 2HKOed. Aqua tail is more likely just an alternative to Ice beam in most sets.
Weezing still walls physical Lucario about as well as Gliscor does. Gliscor can also run 280 speed to outspeed Lucario, though predicted Ice punch hurts a lot.
And what can Azelf actually do with elemental punches? I really didn't find those that useful.. Blissey is easier to deal with Zen headbutt, but many of it's counters have about as good defense as special defense (Cresselia, Heatran, Spiritomb), which makes using punches somewhat stupid idea as they have weaker base power than Flamethrower, etc. Azelf with 252 attack EVs and Life orb does 46.39% - 54.69% to bold Blissey, which isn't even guaranteed 2HKO. Without SR it surely isn't. I'm not sure, but I think that Taunting Azelf could beat Blissey more easily as it prevents status.
Also, using mixed sets means that either it's speed or other attack stat needs to suffer. Not to mention (sp.)defense.
Using Outreage DDMence can be risky, but with Yache Berry it 2HKOs most Cresselias. They can still paralyze it though. Not to forget that SR reduces Yache berry's effectiviness. It won't be as bad as Garchomp just because of those reasons.