I really don't think it's that far fetched. Just because Ovechkin didn't do it doesn't mean it's impossible.
For as great a goal-scorer as Ovi is - his strength is more in his consistency than his actual peak goal-scoring. 65 is a good number for the era he did it in, but his next best total is 56. I really don't think those numbers are impossible to beat in today's NHL. Ovechkin himself as a 33 year old man was on pace for over 65 goals most of last season till he slowed down a bit at the end.
I think someone in a perfect storm of a season could absolutely top 70.
Maybe Laine puts it together consistently and has a breakout season, playing with top forwards/PP time.
Maybe Toronto puts Matthews on a star-studded 1st line with tons of minutes and he becomes the primary goal-scorer on his line, and perfect storm has him hit that. If he could play with Marner and/or Tavares, i could see it.
Maybe one of the Colorado or Edmonton players benefits from the insane 1st line they're on, and one of them goes on to score something crazy.
So yeah I think it's possible. I didn't list Ovechkin - I think at age 34 him getting there seems almost impossible, but i suppose i shouldn't count him out either. Stamkos is getting up a bit in age too, but playing with Kucherov it could be possible for him.
Don't forget Cheechoo hit 56 a few years ago playing with Thornton. And no disrespect to Cheechoo, but he's not of the caliber of any of the guys i mentioned. So if you put any of these guys i listed in a situation as favorable as Cheechoo had - I could see 70 as a plausible target.