It took Facebook 8 years to reach a value of 100 billions which would be $4761 for each coin.
If btc reached just one tenth of that value in the next 6 years they will have to grow with atleast $1 every week on avarage.
To reach the same value, within 6 years the price would have to grow with $2 each day, on avarage.

Ofcourse such growth would not be linear but go in waves.