Yes, I think it's a conversation that needs to be had.
I'm not sure about a seachange but, as a starting point, an acknowledgement that having children younger is also a valid choice.
I had mine in my twenties and encountered a fair amount of surprise and not a little derision in some quarters. There was a definite sense that I was therefore abandoning some kind of glittering future (ha!) and letting the side down.
Ten years down the road and while there's a distinct lack of glitter, my kids are all established at school and my work life is happily ticking over again.
I don't think we should prescribe any set path but we should recognise that in some ways we exchanged one accepted pattern, that of marrying and having children young, for another.
There are upsides and down to entering parenthood at any age. On the downside, having babies in my twenties certainly set me back career wise at the time. On the upside I feel much more competent and capable now that I'm in my late thirties and more able to achieve much of what I hope to and, as I did have my children fairly young, I'm not faced with trying to start a family as well.
Sorry, that turned out to be rather long! Basically yes, I do think we should spend rather more time talking about this, but not only from the fear of falling fertility and certainly not from the viewpoint that there is a right time to start a family.