Yes I think so. Many people realized that Gnutella isn´t Fasttrack, many went back to Kazaa. The people who stayed within the Gnutella net tried a few other clients and saw that there are better ones without ads and other crapware.

As PapaSMURFFS said, Limewire and Morpheus are using the same network so you find the same files with both clients - I am not sure can you see in Morpheus from which client you are downloading? If not try one where you can see it (not Limewire or Bearshare they are clustering, they connect mainly to own nodes), you will see that there aren´t many Morpheus clients left.

Morgwen