There are a number of excellent works available for tenor, and I think professional players both now and waiting in the wings should do their best to get more tenor rep written. My first suggestion would be Michael Cunningham's "Trigon op.31" - I think this would be most similar to Fuzzy Bird since there are jazz influenced elements to the work. You could also try Marc Satterwhite's "aprilmourningmusic," which is a very somber, emotional work for tenor and prepared piano (plenty of altissimo in this one though). There is also a sonata by Hans Kox that is supposed to be very good (although I have not heard it myself).