I, too, would love to have an MVP-level forward who is highly skilled and a quick skater. But while quoting long-term numbers makes sense for the HoF, it is less relevant for assessing a player's current value.
Hall has not been that 73-point player for two years, neither in Arizona or in Buffalo. Admittedly he is only 29, but he is well off that pace recently (60-point pace last year and 48-point pace this year). That is indeed not better than Tatar (73- and 48-point pace).
Maybe he will regain his form. Maybe. But I think we already have enough veterans whose performance is flagging, and who we hope will regain their former performance levels. I'd rather not add another reclamation project.