The Unicoach (bus style front end) production started in late '95 and there are still a some of them on the road (don't remember exactly but they didn't make but about 15 or so in '95). So a '00 should have no problem giving you only 10 years service. You will also need to keep in mind that other than interior updates you will at some point need to update the slide seals, tie rod ends, and other bolt on parts that will be coming to the end of there life span.
You will have a learning curve that will seem large to start with but with time you will learn the tricks of the coach. Even if you hire your maint. work done there are things you need to have knowledge of. Here is an example. With their disc brakes you will want to read up on there service requirements. Here is a link
http://www.meritorwabco.com/MeritorW...ument/mm4m.pdf
You may want to go here
http://www.foreforums.com/index.php to talk to some hard core F/T owners about the specifics of a '00. But to answer your basic question, If we were in the market for another F/T, yes the right '00 would be worth updating to our taste.
4T