I think only the PIM records and probably Selanne's rookie season records are likely unreachable.It would be great not getting 1.0 history back as most of those records are not breakable. It's fun seeing records being broken in my lifetime.
Scheifele's on track to break every one of the old 1.0 career skater records (except PIMs). Single season scoring records are no longer inconceivable...although you'd need a real superstar to break them (and even then, Wheeler was only 8 behind Housley's assist record). Hellebuyck's already broken every almost every career and in-season goalie record.