I'll let you in on a little secret: the amount bought is exactly the same as the amount sold.
Sorry, I wanted to say sold by cryptocurrency exchanges themselves and not users. Basically "dumping"
All major cryptocurrency exchanges turn into "bad guys" and only allow people to buy bitcoin and not sell it
do you think that this will have a positive impact over Bitcoin's price?
Yes, because if ever this might happen, Bitcoin will actually be considered as the victim in your scenario.
Don't you think that people will try to sell bitcoin for less and therefore impact the price?