IMO...talented and really good players do it for 5+ years. I think consistency and longevity are the trademarks of truely great players. Furthermore, to be considered the most "talented player of all time", I believe your looking at guys that did "it" for 10+, 15+ seasons. I used to hear the same chatter about players being the "most talented", or could be "greatest of all time" and ultimately end up not even being close. LaFontaine, Lindros, Pavel Bure, D. Hatcher (touted as the best complete package looking size and skill for a D man of All Time...granted that was ESPN and it was pre-CBA), Forsberg, Yashin, Bertuzzi (back in the days with Vanc...used to be touted all the time that he may be the best Power Forward of all time), ....you get the point. None of these players would get on anyone's radar for making anyones "All Time" SHORT list (at least if your sane). Unless you consistently perform year-in year-out, and do this for 10, 15+ seasons....I don't think you'll ever be considered as the best, greatest, most talented, of all time. Let's see where Sid is in 5 seasons....then the conversation may be relevant.
Crosby's stat lines from the past 6 (that's six, as in one more than five) seasons:
24-48-72 (in only 53 games)
32-34-66 (in only 41 games)
Sounds like he's doing it pretty consistently for 5+ years to me. As a matter of fact, he's only getting better.