Patch 5.4 will be dropping in two weeks, and that means that the battle in the Barrens will be going away, forever. All of your Radical Mojos will need to before the patch drops, or else they'll become worthless. There are a couple things that are sticking around, but they're the exception (the pet, 24-slot bag, and Brawler's Guild item).
Gear wise everything will be going away as well. Blizzard has made it clear that there are no plans to reintroduce the gear right now, for cosmetic reasons or otherwise, and I'd take them at their word. People have speculated, including myself, that it'd not be out of the picture for them to be introduced as Darkmoon Faire items at some point, but if Blizzard agrees with that, they're not letting on. Either way, as of this writing you have two more chances to get the gear you want -- so double time it over to the Barrens for your grinding!
Crithto made a post on the forums concerning exactly what's happening, and you can read his full blue post after the break.