Toxic masculinity arises from limited masculinity. All that seething disappointment and rage from feeling like you don't measure up to this standard that exists, but not truly, had to land somewhere. When you're boiling over, that's the toxic masculinity.
Other than that, I agree with you for the most part. Except, just like the expectations places in women started to be rejected by women, men need to be the ones to reject the narrative. Then things will change. You make it sound like it was so easy for us women. That there were no hurdles. That the doors were opened and the path laid for us.
No. We had to fight and scrap for every step. We're still knocking down doors and laying trails, having to prove ourselves every step of the way.
They'll have it easier because women will be more accepting of and are even asking for men to develop their masculinity beyond the false narratives of provider and protector. They won't meet anywhere near the resistance that women did and still are. But they've got to be the ones to reject the limited narrative of how to be a "good man".