Isn't this a forum to share our personal view of cycling? Or I'm not allowed to have a different opinion? For me (and history shows that), domestiques are not remembered at all (very few are), their legacy is not remembered for their work to other riders (I challenge anyone who just started watching cycling right now or 5 years ago, to say who is, for example, Vanendert without going to search). Is Ullrich remembered for working to Riis in 96? Or Cancellara to Andy, doing that incredible ride in 2010? I don't think so. Riders with WVA's ability, with a big caliber are not remembered for what he did two days ago.
WvA will be remembered for being a winner who was also a great teammate. You are correct that a racer who spends their entire career only working for the team will not be remembered by most, but WvA isn't that guy.
History is a bad argument because before the www we never heard about anything but the winner unless we dove in, but most people don't.
You ask if JA or FC will be remembered, yes, you just posted about events other than their wins didn't you? I'll be dead by the time we are discussing the history of WvA, but I bet he will come up.
Also, one of my ongoing rants: who gives a F about past, future...race in the now, enjoy the moment, who cares about how a racer will be remembered, enjoy their exploits today/this race. That's not to say that I get to decide how you enjoy racing, but shouldn't the racing be more important than 'the history books'?
EDIT: I started watching cycling back when LeMond was winning (a USAer winning got the TdF on WWS). I didn't really 'get into' cycling until the early '90s when I started racing a bit on the road to help my dirt racing. That being said, I do remember Vanendert, not for anything that he did, but because his first name is Jelly (or something close to that).