to all OPs:
it would be at least a psychological issue and the Price will rise
this ^
people will be like OMG EVERYONE IS ADOPTING BITCOIN TO THE MOON!! BETTER BUY UP BEFORE I MISS OUT!
price will rally up and hodl'ers will reap the rewards
this is a possibility, but then again 'everyone' may actually equate to a small number in comparison to the number who are already day-trading and as a result 'everyone' would, in essence, be a small number of buyers.