I think it would be really cool if we could progress at the saga rate on the standard servers.
The rewards gained from getting lvl 80 and completing the saga quests on the saga server should be account wide. This would really incentivize users to continue to play once the server is over. The pvp xp and prowess/mastery modifiers would go a long way in helping players level up there other characters.
Additionally, I think it would help bridge the gap greatly if on the standard aoc servers the AA leveling worked the same way as on saga (8 expertise instead of 1 expertise + 3 Prowess/Mastery). On the standard server it takes way to long to reach a decent AA progression. Honestly the game has been out for a long time and if I were a fresh player on the standard servers I would be very discouraged by the overwhelming gap.