Since the museum opened 3 years ago, there have only been 150,000 visitors. Not enough to cover the cost of renting the building and paying the licences.
Hamburg has always had a strong Beatles connection, since they were 5 times 'in residence' at various clubs on the famous Reeperbahn. The Indra, Kaiserkeller, Star-Club and Top Ten are well known to Beatlesfans all over the world and still attract pilgrims to Northern Germany.
So if you still want to visit the museum and its 1,000+ exhibits, you should hurry. That's the end, little girl!