I agree with your last sentence, "Too much $$$$ involved". Specifically, why would Ralph fire Jauron before the end of the season? Is a new coach, interim or not, going to make any real difference with all the problems this team has? If not, why send Jauron packing and continue to pay him? That's not Ralph's style and in all likelihood, it's not get this team more wins this season. The fans are tired of losing and don't really care if the HC is Williams, Mularkey, Jauron, April, May or June.
No one knows what Ralph is thinking, but past history seems to indicate that Ralph will wait until the end of the season to make a move.
Speaking for myself, I hope that Ralph is putting the wheels in motion for a new HC now and has things in place for the end of the season. That's assuming the Bills don't pull off a miracle and turn things around.