Perhaps it would help more people join the guinea pig group if Ubuntu
created an option to downgrade as well. Then again, maybe that's why they
came out with the live cd version and the usb stick versions... to test
drive them before you buy them. But as everyone else has said, if you want
to maintain up to date server updates, etc... then just test driving won't
cut it past the service date so LTS it is unless they choose to allow
downgrading as well.