Sad news. I also had the pleasure of meeting him once after a performance at the Wisconsin State Fair in Milwaukee. Super-nice guy, very easy to talk to, quick to smile/crack a joke, and very gracious with fans. He and his wife will certainly be in our prayers.
Rock Hall material? You could certainly argue that, and I personally would like to see him in. Heck, I even bought my copy of his greatest hits CD at the Rock Hall.
But as much as I like the guy and his music, I can see where that might be a tough sell. I think he's got a couple of things working against him. First of all, I think there's a bit of a bias against the so-called "teen idols". These are the white male singers who flourished during the roughly four or five year period between the payola scandals and the advent of the British invasion. These are the neatly-scrubbed "PG rated" replacements for the edgier performers who came first (especially the likes of Jerry Lee Lewis, Little Richard, etc.) Whether or not they deserved it, the "teen idol" artists were accused of "dumbing down" and "santizing" rock music.
Also, to my understanding, one of the criteria for election to the rock hall is to what extent has the artist been an influence on other performers and the music itself. In my one-man's-opinion, Bobby Vee stand ahead of his peers for keeping Buddy Holly's flame alive...especially early in his career. But as solid as that and the rest of his body of work was, I'm not aware of him being widely credited as an influence.
Then there's the matter of the member of his backup group that Bobby Vee fired in the early '60s. A hard-to-control young musician by the name of Bobby Zimmerman!