It's been a few weeks, what are they gonna sign? If they put something together in two weeks and had people sign a document I would question whether that leadership is fit to run a Piggy Wiggly, let alone a college football conference. People complain about the ACC getting into a horrible TV contract with ESPN, you think a contract created in two weeks is going to be something we all look back on and go, "that was a good idea"?
Their options were do nothing or start the process and make it public. I'm certain they have an idea how much the Alliance TV deals would be worth when they finally restructure and I'm also certain it will be enough to keep schools happy to stay. Without further options to expand, what leverage does the SEC have at this point to increase their projected revenue? With the ACC, Big10, and PAC12 doing this there are literally no more teams the SEC could add that would actually increase value. So go negotiate with major networks and say, "pay us more than the SEC is worth, we have a larger footprint and markets and more matchups to offer". By the time Saban leaves, the SEC might be incredibly devalued, which would be about the time all these negotiations would be going on.
Let the thing play out.