Kapoor's never had any divorce neither did Mahesh. + High profile log they stay just for the heck of it. These two will be just fine, i do think Ranbir has changed a lot. Alia was always someone everyone liked cause she gels like that.
It's real, although the age difference and their respective backgrounds (RK's parents didn't have a happy marriage, and Mahesh B is one weird dude), makes me feel it won't last long.
But with a baccha into the mix, maybe Alia stays in this marriage for life, just as Neetu did.