When VG247 caught up with Live Producer Aaron Campbell and asked him about any potential server merges, he had this to say: "If anything, The Lord of the Rings Online is growing. We have no plans to merge servers." Since Turbine nefariously refuses to release subscription numbers for any of their MMOs, I guess we'll have to take his word for it.
Is it really that difficult to believe though when you consider the steady stream of content Turbine releases in the form of new Books? They also launched a strong second anniversary campaign, which included a digital download of the original game plus the Mines of Moria expansion for only $9.99. This pricing is still available.