Okay, are you ready to hear (or read) my prediction on that?
He started out a user of imgflip in March of 2015 and he stopped a year later with 2,390,000 points. Just multiply that by 2 years and add 4 months, he'd be flirting with 5 million points.
I know it isn't that cut and dry, but I'm guessing, with the type of flow the site has now and if he continued at the same pace of meme making he was doing from the beginning, he'd be closer to 6 million now. Just as a quick guess and some figuring.