This is a really terrible arrangement for global players, probably the worst in the game. The only ones who can be attacked by two ages up. The already had a raw deal - a low level global has defenses so much worse than a high level atomic, that was probably the largest gap in the game before. Now it is even worse. And no one can get to CW or atomic without going through global, so discouraging globals from playing is obviously a pretty bad plan.
It is a clear acknowledgement that there is not an adequate atomic player base. They need to make changes that make it much much faster to get to atomic for all players, so they can keep a strong active player base at the higher levels, rather than this stupid gift to their strongest players at the expense of newer ones.