Originally Posted by nightowl
She'll be back, it may take an episode or 2, but she'll be back. Probably about the time Ted and Robin break up.
That sounds like the most plausible scenario. I don't think the show would be as funny, and be too Friends-ish (it's a little too close as it is), if there were two couples in the main cast. The dynamic of a well-established couple, a friend looking for love with the girl who doesn't want it, and the guy who tries to direct him to love in all the wrong places and ways, is what makes the show work. If both couples are around for too long a time, I think audiences would lose interest.
I was getting concerned about Robin because up until yesterday's show, her character seemed to be going nowhere and eventually being written-off the show. With all these new things about her life popping up, it looks like she has potential to be interesting again. Besides, I've believed from the start that when the show ends, she and Barney will end up together. (I think it's the most logical way to conclude the series, besides revealing the identity of the "mother," that is.) So something needed to be done to keep her character around until the series' conclusion.