Pretty much how I felt about the FR continuing down the "MOAR DETAILED NPCS" "Every innkeeper a level 16 fighter!" "Lengthy, complicated RSEs you don't care about!" "Good goddesses of necessarily-neutral concepts!" "Detailing every tiny fraction of setting no matter how many times we said we wouldn't!" path of late 2E and 3E. I did stop spending money on the product, whereas I will almost certainly spend money on this product.
I don't recall WoTC or TSR forcing you to play in the Realms. However, many people did. Enough for it to be the one old campaign kept when 3rd Edition came out, and for it to be the first campaign out when 4th comes round. I don't believe the Realms needed such a drastic change to be a success, either on it's own merits or a financial success. (If you have information about it's financial success or lack thereof, such as having access to WoTC's financial data, I'd be happy to see it)
Furthermore, many things you decry in that post are things many fans of the Realms like. I quite like having a Good Aligned Goddess of magic. It makes a change. I like my detailed NPC's with their own hopes, dreams, schemes, ideas and plots. I like having things detailed. I can use as little or as much as I want to. Again, no one forced you to use the Realms. You didn't like it, and that's fine. Many did.
As for the number, pffft, if we went by surveys on specialist messageboards, we'd believe a lot of crazy nonsense. Your math, particularly, is fantastical, and your attempt to work out how many people like the FR before the changes by messing around with these figures? Really silly.
Last I checked this was a specialist messageboard. It specialises in DnD. This forum in particular specialises in 4th Edition, so there's already a bias.
People on Candlekeep and the WoTC FR boards have access to exactly the same information as you do, and have come to a different opinion to you. If there's enough information for you to form a positive opinion of the new realms, then surely there's enough information for others to form a negative opinion?
Furthermore, some of the posts here are quite annoying and frustrating, along the lines of people laughing about someone's favourite toy being destroyed, saying they were silly for liking it and rubbing their new, 'cool' toy in their face.