If he gets 60Gs and another rocket next year he has a legit shot as hell be at ~460 after 10 nhl years
He would need another 475-480 (assuming OV ends with 935 to 940 after next year). He will need to play 12 years and avg 40Gs per 82 games to get that.
Will not be easy, as he will need to be healthy 90% of the time and likely take advantage of his prime and high scoring environment to pop a few 50G seasons in there to habe a better shot.
His chances ate <10% as of now, but he is the best bet to take the record out of anyone in the NHL or coming into the NHL in next 5 years as of now.
If he cant bounce back and is a 35G guy moving forward he ends with 700-750G and is a lot back of OV
I would say <2.5 to 5% chance.
What you're proposing looks something like this - I call it an "almost possible scenario":
Note that I have had to increase some numbers to get him to around 923 career goals - since surely Ovechkin will score some more goals next year.
But he'd need a 60 goal season next year, and then to average 40-45 goals every year after that. This is significantly unreasonable for a multitude of reasons:
1) Health - this would assume Matthews can somehow have better injury luck in the older ages of his career than in his younger ages. Unlikely although not unreasonable
2) Peak play - Matthews has scored 50 actual goals or more only twice in his prime aged years. Expecting 105 goals in his 28 and 29 year old seasons are also unlikely when you factor in time missed to injuries and the natural aging curve.
3) Aging - Let's say he does go 60 and 45 goals next 2 years (or 55 and 50), he'd then be 30 years old and need to average 40 to 45 goals for 10 years from age 30 to 39. That is just flat out almost not possible (<1%). Sure - we saw once in a lifetime back-half goalscoring from Ovechkin. But there is absolutely no reason to even think that Matthews (who has had injury issues) to beat the goalscoring curve that almost all elite goal scorers have seen.
Scoring 400+ goals in his 30's just is not going to happen.
IF he scores 150 goals in his 28/29/30 seasons (which he needs to do based on the above chart) - that would be the SECOND highest 3 year rolling goal total of his career. That's very unlikely. But even if he does do it, he'd need about 372 goals in his age 31 season onwards.
If you look at the players that had the most goals up to the end of their age 30 season, and then how many they scored after that. You'll find that 150-250 is a likely number.
Hitting 300 would be absolutely crazy and should not be expected (Esposito/Selanne), but that would still put him 50-70 goals shy. He would literally need to be the best "30's goalscorer" of all-time (ie. Ovechkin), or play 82 games a season until he's like 42 (to hit the games that Howe played). There is no logical reason to expext that.
In fact - I don't think you realize how unlikely it is that Matthews even plays until he's 40 (which is what your assumption of 12 more seasons after next season has it at.
Look at the last couple seasons amongst forwards. ZERO 40 year old seasons. The reality is, it is unlikely that Matthews even plays in his 38 and 39 year old seasons, let alone puts up 80 goals between the 2 seasons.
On top of that, a good chunk of these guys that were 37/38/39 were all playing like 55 games or less (injuries much more likely at that older age)
I would go further to call this "Matthews 99% best-case scenario"
Matthews would still need to have almost everything go right for him to hit this (and still fall 50+ goals short of Ovi.
He'd need to:
1) Score 110 goals in the next 2 seasons, which would be the highest 2 year goal total of his career.
2) Stay extremely healthy - which he does not have a great record of so far. No reason to think that will change or get better in his 30's
3) Actually play in his 38 and 39 year old seasons - which as illustrated above, is unlikely.
5) Matthews would need to have the 10th highest goal total for each "x" aged season in NHL history for ages 31 to 39 (ie. 41 goals is the 10th highest ever done by a 33 year old. 36 goals is the 10th by a 34 year old).
For #5 above: This would require him to not only stay healthy, but to have an all-time level of consistency and dominance as a 30's goal scorer. This would require of him to score 312 goals from age 31 onwards, which would be the 3rd best behind the 2 most dominance age 30 goal scorers of all-time - both of who have significantly better durability than Matthews.