The game Jazz Jackrabbit 2 has been abandoned by its creators for at least eight years, is filled with bugs, has less customization than SRB2, and doesn't have the source-code released, yet the community still manages to stay alive. Judging from that, SRB2 should live on for quite a long time after 1.1 comes out, make no mistake about it. However, after a while, interest will probably die out, as people move on to bigger and better things...