Depends on how much patience one has.
It may be worth the trouble(wait)!
Well, my gf was a very shy person at first. i'd say that I gave her a LOT of time before she got out of that balloon.
Not if you enjoy taking control and guiding the person through social scenarios. It can be refreshing to see a person blossom from being a wall flower to being a star, all because of your guidance. However, not all wallflowers were created equal. If a person lacks social skills because he/she is simply not gifted with enough grey matter to be cognizant of the moment; run and never look back.
I have infinite patience for that... excessive shyness is a turn-on for me.
I tend to be the shy one, and has resulted in pretty much all my gf's being the more aggressive types