The TT is certainly the greatest road race no doubt about that but it is most definatly not the last great road race.
Ulster Grand Prix
Tandragee
Cookstown
Skerries
Kells
Walderstown
Killane
Mid-Antrim
Faugheen (a new road race on the calander)
Dundalk
This list just gets bigger and round the world there are other location where real road racing continues.