At least since OP has a boy she will probably get to experience what her MIL is experiencing -being surplus to requirements-unless she has a kind, understanding DIL.
I'm the mother of a son. And precisely because I do hope to have a good relationship with any future DIL, I try to avoid the sort of entitlement-mentality, "I should be JUST AS CLOSE AS HER OWN MOTHER!" anxieties I see some MN exhibit. I try to be aware that that is a surefire route to being pushed out, because nobody likes to feel pestered and encroached upon by selfish emotional demands - and when a woman's just had a baby, prioritising your own feelings over hers IS selfish.
I will not be any future DIL's mother. Her own mother will. After having a baby, she will be more likely to want her mum there than me. She will be hugely more likely to be willing to learn to breastfeed in front of her own mother than me. She may want her mum at the birth, but she almost certainly won't want me. That's just the reality, when women do the birthing and the breastfeeding, and your own child is a boy. I will hope that tact and understanding and discretion will enable her to feel inclined to invite me to have a good relationship with my grandchildren, because I am absolutely certain that jealously asserting my "rights" over her personal space in one of the biggest life transitions she will ever make is a short cut to a worse relationship with her... and hence my grandchildren.
That's the reality. And as a MIL, it will behove me to realise that she is a human being, not a walking incubator, and that the biological reality will be that I am not the closest person to her, probably several others will be closer, and she may not want me there that much at first however well we get on. She may just want to nest in peace, and that's understandable.
Some women do get on far better with their MIL than their own mothers. Personally, I hope that won't be the case with my possible DIL, because if so she will have had to cope with painful family relationships, and why would I want that for her, for my son, and their children?