She's not really "rebellious" at all ... given me a two-year "head's up" that I'll not be married then.
I think "mature and reasonable" is a good dimension to consider in a W who is going down the D path. On one end of that spectrum is "immature and rebellious" and on the other end is "mature and reasonable.
It seems to me that most people will exhibit a mix of both "mature and reasonable" and "immature and rebellious" reactions to a dissatisfying marriage.
The two-year countdown has a veneer of reasonableness to it, but I think it's at its core unreasonable and immature. If she's willing to share a life with you for two years, she should be willing to have conversations about your marriage like two mature adults.
Me: 50, MLC/WW 45 Young kids Nov 2015: BD1 Apr 2016: BD2 Jan 2017: W filed Feb 2017: D final