Let's assume that the process of vacating the chair has been set in motion by a resolution. Then what?
Rule 5, Section 36 says, "Questions of privilege shall have precedence over all other questions, except motions to adjourn." Therefore, the only way to slow down the proceedings is for a pro-Craddick member to move to adjourn. This would have to be voted on by the House, and it would become to this speaker's race what the Geren amendment was in January: a proxy vote.
Let's assume that the motion to adjourn fails. (If it succeeds, Craddick has proven that he has the votes to defeat the insurgency.) The vote will smoke out the insurgents and both sides will know where every member stands. The Craddick forces will try to find a way to stall a vote on the resolution so they can turn around some votes. If that fails, I can think of only one play left: to break the quorum. Pro-Craddick members might start drifting off the floor. The irony of this development is apparent: Craddick would be employing the same strategy that the "Chicken D's" (Craddick's phrase) used against him during the redistricting battle of 2003.
If the session shuts down without the House adopting a budget, there would have to be a special session, and Craddick would be back in the saddle as speaker.