The reason for the company to make this change is the rise of content duplication. Yes, several people are uploading videos of others original video and earning revenue through it. So, with this move, every user needs 10,000 views to be part of the Content Creator program.
That said, customers who earned the revenue till Thursday will receive their payment even if their views are below 10,000. For new customers, this new rule will be applicable.
Also, YouTube will specifically verify the account which reaches 10,000 views and then approves their application to be part of YouTube Content Creator program.