As I don't read Karan's Twitter posts or Instagram (if he has one). I didn't get the feeling of 'betrayal' or 'snake'. Still, I think that they drifted a bit apart although I don't think in a judgemental way from SRK's side.
I would say that their friendship has a very brotherly touch with SRK being seven years Karan's senior, especially because Yash Uncle treated SRK like a son (maybe even more than he did with Karan)...and brothers can get estranged still preserving their brotherly bond.
Karan speaks of the past in that interview. In the whole interview, he said a lot of things I agree to and it seems to me that he is on the verge to start a new phase in his his professional life as producer and filmmaker...we will see.
There is no need for SRK to come to Karan's show. This year - at least - belongs to ShahRukh and his fans and those who like or love him. I think, also the rest of the year (and beyond) he publicly will only interact with fans on a personal level (the hosts of the press conferences and the Dubai events had been also SRK friends).
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