If you are playing regularly it should not become harder to keep your current tier, because you should naturally increase in capability though playing?
I totally understand why people who have been in G4 but now find themselves in G1 are extremely frustrated, i would be.
I think this is a good point. Arena should not be stagnant. As longer term players get more/new goodies (stone skin etc.) ans as newer term players move up, obviously the compettion will increase.
But if you grow your game, why aren't you stepping up? I think that's a qood question.
The argument that arena should be stagnant is a non starter. Other wise why not just remove all PvP interaction and make arena just another dungeon?