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Well, I guess he deserves it--when you look at some of the other riders who are already in there. As someone already mentioned, this is just the induction ceremony; his entry was already announced last year straight after Valencia. It's also important to note that this is just Dorna's little prize (and the criteria aren't public, as far as I can tell), and therefore its really not much more than a glorified media award.
Of course, on stats alone, I'd say Stoner qualifies for any HoF, but agree with most that 'Legend' seems a strange title to confer by committee. And, seriously, what's with the rush? If you wait another ten years, he still wouldn't be as old as Hailwood during his famous IoM comeback. I know this is a hobby horse of mine, but for ....'s sake, Dorna, are you living in the world of Logan's Run, or something?
I'm not sure about Ago and Hailwood, but Stoner actually compares very favourably with the other riders you mentioned in terms of longevity (obviously with less titles, of course). He had a longer time riding 800cc/1000cc than Roberts and Rainey did in the 500s. And if you want to include 125s and 250s, he spent as long or longer than Lawson and Doohan in Grand Prix Racing.
I'd let Randy in; for him to be denied yet another title would be cruel!
Nico doesn't care about Legend status--he just wants a corner named after him on every circuit on the calender.