On the skysports poll of popularity, I think he scored more than Tsonga and Soderling. Can't say I am surprised about anyone being more popular than Toad but Tsonga was a bit of a surprise.
It will be because he won WTF in London. Also who cares about Tsonga here? No-one. Davydenko got some publicity for winning WTF.
I don't think he'll win a Slam, and is likely to be forgotten. tbh even if he wins a Slam I don't think the media will be talking about him much in 20 years.