Oh boy, did I have to re-read your post a couple of times... now back on topic
We don't know if ALL the Hobbits are like Frodo and Bilbo (after all, they are the same family and Frodo looked up to good ol' Bilbo while growing up) and we don't know if some other creature could have gotten rid of the Ring as well. Perhaps an elf would have been able to do it, or maybe an Eagle... we know that it can't be someone too powerful or else the attraction the ring creates would be even stronger, yet you never know if someone else could have been. Also, we see when the Hobbits go back to The Shire after their adventures that it had been taken over by Saruman and his "friends", with the help of some hobbits who did not know what they were getting into, so that could be a bit of a proof that not ALL the Hobbits were like Frodo.
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