Yes 2100 is far away from our imaginary. We may worry about 2050.
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.