So... It seems to me that while they've had far fewer speaking lines than Captain Fanzone, they've appeared in almost as many episodes.
And with Spike and Carly being mentioned by name and Spike even having his G1 voice actor, well...
It seems like they've practically moved from being an easter egg to being a subplot.
Daniel was at Sari's birthday. Carly's pregnant. Spike keeps crossing paths with the Autobots.
Would it be so bad if they just went ahead and joined the cast?
At first, it just felt like a nod and a wink when we saw them. Now, I'm starting to think of them as characters in the show because it seems like there are always new developments with them whenever they show up.
I was half-joking, half-fanficing in another thread when I suggested that Spike is a Sumdac employee but since Daniel was at Sari's birthday party (and the kids there were all Sumdac employees' children), let's just have Spike take over Sumdac and adopt Sari or something.
Speaking personally, I was more than satisfied with the Witwicky easter eggs but if half the episodes are going to feature cameos them and you're going to give them subplots and speaking lines then I really want them in the cast. (Then again, I REALLY want Jazz in the cast too, as he's become my favorite Autobot in this series. Damn you, Isenberg for teasing us with the cool stuff!)
