Not trying to be optimistic with the current situation with my favorite Lego line and I do not really know much about the sales plans and particular circumstances of those retail stores in US, UK or any other European countries, but here in Asia, specifically in Korea and Japan as I travelled back and forth weekly, I have seen local official Lego stores to re-stock the first and second wave of Middle Earth sets so many times and the Lego communities of these countries really fond of collecting LOTR minifigures and building LOTR MOC to the extent that I bet if you have seen a MOC of Helm's Deep battle with over 1500 minifigures created by Koreans, I guarantee a majority of them is too shy to show off their collections which would not be dwarfed by the mentioned Helm's Deep MOC one.
Personally I have seen with my own eyes one of my friends to purchase 30 of the set Pirates Ship Ambush just to get the ships solely to recreate the scene of Umbar Pirates sailing to Minas Tirith, thanks to him I got 60 of the gorgeous Soldiers of the dead which are glowing and taking a part of my collection. You can imagine that not all of them can communicate effectively using English to surf the foreign websites to get pieces and minifigures from Bricklink or ebay so most of the time, they purchased sets just to get enough pieces to build their own creations, and in this particular case, Middle Earth sets have been driving them crazy with a variety of wonderful minifigures and special color bricks. So same case with Eurobricks, not so many of them would come here to confirm about the popularity of Lego LOTR&Hobbit and how fast the shelves have been cleared and re-stocked with those sets.
Just few lines of my thought which I kept for myself to look forward for more Middle Earths sets coming after next or the next 2 years, it's fine since I'm still busy collecting minifigures of the previous sets and I guess the longer the time that research&development department of Lego takes to put ideas and notable scenes from the last LOTR movies into sets, the more surprising and awesome they would be.