Shouldn't the objective of PvP be to compete against players in a skill versus skill competition, with gear not being a factor? Why are you complaining about players being able to bridge the gear gap? Are you concerned that if everyone had the same gear, you would have difficulty competing?
In regards to RBGs: they're "easier," because people don't really take them seriously. It'd be harder to win an RBG against another good team than an arena match if people took RBGs seriously :P