There should be 1 million people use bitcoin or blockchain technology, it will be more in the future, and the price will surge too.
the problem is the majority of those people are newbie that buy one time bitcoin and hold it forever and you will see only one transaction from them
it's possible already to be over 1M users easily, but only a good group is sending bitcoin all the time every day, the other are doing nothing
Byuing bitcoin one time and hold it make them still an user. We can't define the number of people using bitcoin based only on the number of transaction.