If there is going to be a pet-type class or two coming out in the future, then I'd say "sure, having a wyvern pet is useless". But if there won't be such a class, then I'd say "why not?".

I'm not a lancer (yet), but if I become one, I wouldn't really have a preference if I got a pet or not..

Then again I love in-game pets.. So I'd probably be more excited to see them get the pet. But remember, if they don't get a pet, then I'd at least expect a pet type class to come out later..

(sorry I'm probably not helping at all with this babble)