A few things will likely happen. Time does tend to heal all wounds. So the freshness of people's bitter disappointment will fade, if it hasn't already. Then you'll have kids who saw these movie theaters, and even future generations who will watch all 9 movies totally divorced of all the pressure and expectations and baggage we brought into them. Eventually those people will be the dominant voices in the discussion. And these also won't be the last divisive entries in the franchise, especially now in a world where it has no end in sight.
As Frodo said, it's not to say there will be no debate. There always will be disagreement and plenty of "what ifs", but this is the exact thing we saw with the prequels. To think that it's even fashionable to like them now-- that was unfathomable even 5 years ago.
I doubt that time will heal all wounds when it comes to these films if we're talking about those who are debating the films now. And I'm basically talking about the GenX through Millennials who are the ones debating this film really.
There's been alot of bad blood in the fandom and that's not gonna go away if we're talking about those who either felt the ST got a raw deal or those who feel Disney ruined the trilogy. I haven't seen that bitterness go away ,and its not going to with if we're talking about the older fans.
As far as people whose first exposure to Star Wars was through the ST , and saw them in the theater, I would agree with you if we're talking about expectations
brought into them.
However, I would note though, that just because they may not have come in with expectations as children, doesn't mean they won't form their own views and preferences about how the three films are in relation to each other and how they turned out especially as they age . There views are going to evolve positively or negatively as they age.
They're going to form their own individual views about it and they're not all going to agree. What they feel at 6 may not be the same when they're 26 and they look at the films from a different perspective. Their views may not remain static.
No, they may not have the same sort of debates about what an OT character like Luke would have done, but they may debate about whether Rey should have remained a nobody or not , in addition to other parts of the ST.
At the same time though, the OT films are always gonna be there so they'll have access to go back to those at look at them in relation to the ST.
The same way we look at Casino Royale from 2006 in relation to From From Russia with Love from 1963, younger fans are still gonna be looking at those older Star Wars film which is gonna give them different insight to the films they grew up with.
The OT and the PT are gonna be there . If they become uber SW fans, they're gonna wanna seek those other films out and those other films will effect how they view the films they grew up with.
It also depends on what follows ST. If episode 10-12 stink or aren't as good, that will also effect how younger generations look at the ST.
Now, whether that debate is as bitter and divisive as it is today I can't say. I would hope they do better than my generation has ,but who knows.