Just an idea I had a little while ago, thought I'd suggest it and see how ya feel about it.
How about if sometime at the higher end of the game you could go on a quest for a "secondary" profession? It wouldn't actually make you another profession, but it could give you access to a few new things.
For example, I know that a few people on the Adventurer boards have suggested giving us pets. Now I don't particularly agree that we need pets, but it'd be nice if we could do a quest for a secondary profession of MP and then use nanos with an Adventurer/MP profession restriction.
And it might not even be too unbalancing... After all, everyone would have a chance to do it. And it would give all the level 200 people something to do... ^_^
So... whatcha think?
(And please try to keep this a nice kind of post... no need to yell at people. If you disagree, just argue calmly...)