Just seeing the article about Alexander Rossi turning down an opportunity to drive IndyCar to "keep the F1 dream alive" - ok, so he managed to race 5 rounds in an extreme backmarker team. Assuming he might NOT get another ride in F1 in 2016 (and ignoring the fact that he may yet go to IndyCar anyways), it brought to mind a couple of other cases of drivers passing up an IndyCar opportunity in order to desperately hang on to that illusive F1 glory. In other words, they might have had prosperous careers in the US, but instead decided to pass on that, only to fail F1 instead, and then basically disappear from open-wheel competition.
One that immediately comes to mind is Christian Klien, whom Red Bull wanted to slot into an IndyCar ride. The other would be Kevin Magnussen, who could apparently have raced in IndyCar all this past season, but passed on that in order to sub for Alonso in the first 2015 F1 race (still not quite sure why he couldn't have done BOTH) - again granted, Magnussen may yet do IndyCar - although now it looks more like he'll end up where most "failed" open-wheel racers go: WEC.
Who else can you guys think of that followed a similar path?