Between Ovechkin (likely similar conversation with Crosby in two years), LeBron, Tom Brady, Ronaldo (same as with Ovie/Crosby, likely similar convo about Messi in two years) it does seem like the circumstances in the present day do allow for the GOAT level talents to stay at an extremely high level deep into old age as long as they don't get too affected by injuries. Any pure longevity stuff in sports is certainly in more danger than may have used to be conceived. So things like most times doing X could all certainly fall.
Gretzky point/assists is so tough though specifically because it takes the combination of an amazing talent that is a standard deviation ahead as well as leaguewide circumstances that are so favorable for such a player to really run up massive totals.
I believe you're right. Given enough time, medical and longevity advances will allow somebody to play at a high enough level for long enough to surpass the career totals records. It won't necessarily take a Gretzky-level player to eventually do it.
I've always maintained that 163 assists in a season is the most unbreakable of all the records. This is an outlier on top of an outlier.
If Gretzky had never existed, Mario Lemieux holds the record at 114. This itself is a mark that has never really been threatened by anyone else, Orr, McDavid, and Kucherov just managing to hit 100. We'd probably agree that this record would be almost unbreakable, but within reach enough that a once-in-a-century playmaker could come along and break it.
In our real timeline, that player did show up, Gretzky. He surpassed 114 several times, with seasons over 120 and even a season of 135, which would absolutely be seen as an incredible outlier compared to 114. 135 would be considered effectively unbreakable if that was the record Gretzky left us with.
And that record still somehow got absolutely smashed by the 1985-86 version of Gretzky. A bigger gap up from 135 to 163 than there is down to 114. Even that "once-in-a-century" level playmaker was unable to come close to that total under very similar conditions in the surrounding years.
In the years where Gretzky exceeded 120 assists, the distribution is reasonably similar from year to year. More against bad teams, fewer against strong teams, fairly similar numbers of games with 0, 1, 2, 3, or 4 assists. The difference in 1986 is that you see a 6 and two 7-assist games, ostensibly in place of 0-assist games (several less than surrounding years). Gretzky only had a few such games in his whole career; three of them being clustered in this one season (that doesn't appear to have any special circumstances attached to it) is itself a statistical outlier.
I think it's fairly well acknowledged that Gretzky put a greater focus on playmaking over goal scoring starting with this season, but his assist totals never again exceeded 122 after 1986 (he did pace for 136 in his 64-game 1988 season, but still a very far cry from 163).
There's no other statistical category I can think of where the #1 result so utterly blows away the #2 result. And the #2 (and 3, and 4, etc) results belong to that same player, who would undoubtedly be considered the greatest ever in that category on their strength alone.
For however long the NHL continues to operate in a comparable manner to today (schedule length doesn't exceed 84 or 86 games, scoring levels never exceed those seen in the 80s, star players play half the game at most, usually well less), 163 assists will be the record. It will outlast the NHL, or at least our conception of it.