Source for losing that much of the player base? Because the game seems more packed with people than I've seen it in a long time. Though I do play in open, where, you know, you can run into people.
Look at the Game Stats for Player usage before and after, it's not hard, google it. 10's of thousands of people bought ED. Only a couple thousand still play. The actual stats are posted in various threads here on the forums (One thread even has ED's investment portfolio which shows their company is tanking hard).
But that's not the real issue, even when you post evidence of such, people go Oh well you can't really count those numbers because "Insert reason here". People will hold whatever opinions they want, regardless of what evidence we post. If you post the steam numbers they go "Oh well that's just steam!" If you post sales numbers, they go "Oh well those are not really an accurate representation", if you post activity numbers from Game spy they go "Oh well that's just game spy", etc etc etc.
Evidence has been posted over and over again. People simply refuse to see it, Kind of like Religion. God is about as probable as an invisible teapot orbiting the sun. No we can't actually prove he does not exist, but the lack of evidence (or rather Evidence against his existence) is staggering. Same applies to ED's Floping.