They need to find a way to make Lordaeron more appealing to Icecrown players, and for new ones.
I think they can do that by making Lordaeron normal, stop with the "hardcore" thing, activate RDF, add heirlooms, and allow donations there (for normal items only, not the heroic counterparts).
I could make many points how RDF and heirlooms have way more pros than cons, but wouldn't like to get into detail. Maybe other post.
Lordaeron is losing players very fast, new ones aren't coming, so changing these few things should make players from Icecrown switch realms.
And no, Lordaeron isn't "hardcore' anymore. There's hardly anyone doing ICC heroic weekly runs, no one kills LK HC anymore. All the good guild left the sever after they got kill on LK 25 HC.
Either they are going to make some changes, or Lordaeron will keep losing many players.
Of course not everyone would be happy with changes, but I am sure if we make a poll, majority will vote for changes, if they favor higher population.