By 2100 most of the bitcoins would have been mined out. So, price may got stabilized. Dollar would be referenced with bitcoin for it's value. Many people will have their surname as bitcoin or bit.
Yes, in 91 years bitcoin have experienced all the kind of financial situations and would become as a versatile currency. I wish to live in the year 2100 to use bitcoin for my daily uses.
Yes even bitcoin is already a versatile thing, we need to learn how to act in the event of peculiar situations like Greece recently faced. As you stated by the year 2100 bitcoin would lead world economy at half of world net worth will live in bitcoin's block chain.