Disclaimer...I'm a shipper of good writing/stories...not any particular couple or character.
Thus, Betteboo, I am not a Robin or Scrubs fan fave. What I had wanted to see was a decent storyline for Robin, Patrick and her family, and what I ended up watching was the Mary Sue Sabrina Magical Wedding Gown and Pee Stick Tour instead. By the time the writers got around to actually writing for Scrubs, KMc's time was just about over. According to Kim she offered to stay around longer, but her offer was rejected. And according to RC's interviews, the writers apparently all agreed that having Robin leave to defrost Jason was the best they could come up with for Robin's exit story. It is what it is.
Afterwards, Patrick mopes and cries for several days and now he too has more or less disappeared. If the writers were interested in writing for Patrick as a stand alone character he would be on air now with or without Robin, because Patrick is about to become a father again...unless Sabrina's baby is Carlos' child after all.
From all apparent appearances, once Robin left and other stories took front and center, any interest in writing for either Sabrina or Patrick and their baby story waned and chances are it won't be revisited again until shortly before Robin is due to return once more. Again, JMO but Robin was the angst for Sabrina and Patrick, and without Robin neither character seems to have much of a storyline.