Why are you (as company, not you personally) so set on these saga's?
We're not in the least interested in them, the quests in there aren't as much fun as the heroic Eberron quests.
the balance is a problem too, even if we have to run all the saga's once to gain a heart it would be too much, some of these quests are too high level to do at 20 (esp on EE).
Are you having trouble keeping the forgotten realms populated?
Are you trying to sell more forgotten realms content?
What is the real reason behind all this?