You talk about sales rankings but you don't go into detail as to these figures.
You can't really rely on rankings because exactly who are they in competition with? Also, yes people have purchased the game. It's a new edition and people do have to buy it to get the full effect but who's to say they are not buying it and then deciding to go back to another edition after they've played it?
All new editions sell well in the beginning.
People are discussing those games, but are discussing them significantly less than 5e, and people are talking about 1e less and there is no drop in 5e discussion. People are talking about OD&D far more than either 1e or 2e (almost combined).Those are games that are talked about so I'm not sure how that confirms anything beyond people are discussing these games.
Well... as mentioned there's the Hot Games chart.You might want to try something else if you are trying to prove me wrong.
I certainly haven't noticed anything like that.Something I've noticed in my area is that people are dropping their 5th edition games and going back to playing 1st/2nd edition games... Is this becoming a trend? .
What sales?
Do you have any data to show this? All I see is an edition that has managed to have a lot less overhead because of the slow release. I don't see this as confirming anything really. Profits don't always mean something is selling well.
Wizards has gone on record to say that it was their most successful launch (of a new D&D edition) ever. They just won't give specific numbers.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.