Not all the bitcoins are for sale at any price.
If you go to the bitcoin exchanges, only a fraction of current money supply is for sale there (both in asks and in selling reserves). The majority of bitcoins are held in cold storages "for ever".
sure, but a $100,000 price would certainly tempt some lost coins out of the ether. i guess it would depend on the nature of the rise. if it looked like it was sticking around then sellers would sit back and do nothing. if it was a parabola then the fall would be brutal and swift.
0 to 1-10 billion market cap can happen without alot of people or money and can happen over and over again.
to get into the trillions, even when it's just market cap, that's a once in a bunch of generations deal and will not happen in a couple of years. maybe bitcoin is it. we'll see.