The most amazing thing about Ovechkin -- besides his goal productivity, that is -- is his resistance to injury. Only once in 13+ years has he even missed more than 4 games in a season. (Seven times he's missed one or no games.)
It's not so surprising in recent years. He's older now and lets teammates do more of the 'heavy lifting', by which I mean he doesn't do a great deal of the hard-digging and driving the net one against three, and he more so waits for passes to come to him in order to shoot. That's all normal when a star player reaches a certain age.
But what's amazing is how resilient he was when he was younger. He was a wrecking ball and yet never seemed to get hurt.
Regarding the all-time goals record, what's working in his favor is some changes in the NHL. The game is just a lot softer now than almost any time in the past, which will extend the careers of some players (not that he seems to need 'soft' as I've described above, but at least he doesn't have to worry about Chelios, Pronger, or Matt Cook head-hunting him now).
His record of resistance to injury certainly provides a stark contrast to Crosby in his 20s, despite the NHL getting less and less physical through that period.
I still don't think Ovechkin has much hope of scoring another 276-or-whatever goals, though. That's a heck of a lot of goals past age 33. In the past 40 years, six players have scored 200+ goals from about age 33 onward (Selanne, Jagr, Messier, Brett Hell, Alfredsson, Recchi), but none in these 40 years have scored as many as Ovechkin would need (Selanne scored about 248 past age 33).
However, Gordie Howe did score about 332 goals past age 33 ,and that with six seasons lost to the WHA. Bobby Hull (who is Ovechkin's closest historical comparable) was sitting at 604 NHL goals by age 33 when he defected for the WHA. So, he was almost exactly at where Ovechkin is now in career totals, at the same age. Hull continued scoring at a furious rate in the WHA (including a 77-goal season!), but was pretty old when he came back for one last try in the big League in 1979-80, scoring 6 goals in 27 games before calling it a career.
I guess if Ovechkin ages as well as Howe did (or maybe as well as Hull, though it's debatable), he can possibly do it. That's a pretty steep slope, though, with maybe two or three goal-scorers in history aging that well.
Pessimistically, I can't help but think that Ovechkin is kind of overdue for some sort of semi-serious injury. It's almost other-worldly how he's managed to avoid it.
But it's exciting that we can even have this conversation!