There's a theory on the Mrs maisel subreddit that the flash forwards are a glimpse of what could happen, an alternative future if Midge doesn't stop sabotaging herself and her relationships with everyone.
I'm not convinced. I think its been sign posted all along that Midge doesn't particularly like being a mother. She's selfish which is what is needed for her to succeed but it will have consequences later down the line. And i need to know what happens to make her fall out with Suzie!😭
I think its entirely plausible she wouldn't have a great relationship with her children whether she was a housewife or a famous comedian.
Also, I hope that's not the last we see of Lenny! I wonder if what happens to him on 1966 has a big impact on Midge and causes her to alienate everyone she loves 🤷♀️