To me elite goalies is only a handful of guys. So in that sense, no you don't need an elite goalie. MAF, Murray, Crawford, Quick, Holtby to me are a step below elite. Some further than others. So you can argue you need elite performances, but not an all time goalie. Look at Holtby this season - he was at best average, but his stats show below league average. He was poor. Even his playoff stats are good but not world class.
That said, I think we're biased as Rangers fans, having had Hank, as to how much goaltending matters. We've taken it for granted and emotionally say that b/c we didn't win, it's not that important and/or the model for success. Some of the posts you see now from Rangers fans have swung the pendulum to the other extreme on how you just plug a hot goalie in and win.