Yes, we all hope that there will be a new movie coming out, but in the meantime, let's keep ourselves entertained with fanfiction. Shall we?
Also, I really don't think that LBT will just die out. Some of the sequels, including 13, received quite high ratings on amazon.com and other websites. Maybe because the economy became bad, Universal Studios temporarily stopped production. Once the economy recovers, they might restart the series again.