Where's Sly?

I don't really have a lot to say about Shakespeare's THE TAMING OF THE SHREW....the biggest thing that always bothers me about this one is the fact that the whole joke on Sly ends by the end of Act I.  We have this whole long "Induction" where we learn about Sly and the Duke's joke that he's playing on Sly, then we see them again, very briefly, at the end of Act I where Sly is accused of falling asleep during the play, and then that's it.  No more Sly.  What happened to Sly?  Why did Shakespeare not finish the frame?  What's the deal?  Did he get tired of that part and just leave it out because he didn't care to finish with it?  Was he forced to finish the play or turn it in "as is" because they needed to begin performing/practicing the play?  What was the deal?  It's so odd.....

I'm not going to talk about how truly odd it is that Petruchio is able to "tame" Katherine to such a degree that she is....and apparently pretty quickly, at that!  Interesting.....