Hrithik Kareena stopped working due to personal differences and the rumoured affair. I don't think Ash and Hrithik would have such problems.
Besides, I believe Aishwarya's script sense is a tad better than Kareena's so she'd have never done what Kareena did in her earlier movies.
I have to disagree here slightly. Yes the rumours were there, but they were there from Day One - when Kareena Kapoor had worked on Kaho Naa Pyaar Hai in 1999 - yet they still signed many movies together. I do think the rumours played a small part in the reason they didn't work together for a while - but it was also attributed to the fact that all their films in which they were the lead stars had failed miserably commercially, even though their pairing was a hit with the audiences.
Remember they had both signed Dil Dhadakne Do and Shuddhi at one point, so they were ready to work again. The films didn't end up happening for various reasons.
"Script sense" is something we can use in hindsight, but is there that much of a difference between what the two of them were signing in 1999-2003? They have in fact been associated with/replaced with each other in at least 4-5 projects during that period.
And also, there were apparent rumours between Hrithik Roshan-Aishwariya Rai in the media during Dhoom 2 days - and that's when she was engaged to Abhishek.
Imagine the rumours when they were both much younger = more likely.
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