Otherwise, this game will not last long. If the game doesn't allow casual players to be successful and have fun then they will leave. Then all that will be left is hardcore gamers. Then the hardcore players will leave because they say the servers are too empty.
Its a death spiral that happened to DAoC when trials of atlantis released and allowed the hardcore gamers to gain too big of an advantage over casual players. Though to be fair some of the imbalances were already there before trials of atlantis.
I do think that Camelot Unchained is on the right track with the philosophy of horizontal progression. Hopefully that will mean small incremental power gains for players that don't unbalance the game.