It seems to me that today is all about whether or not the COG will approve a lease based on the previous version, which does not include an "out clause" for the COG. So, we'll see how firmly various council members stand by the revised version with the out clause.
My guess is that Bowers and the city financial staff have urged the "out clause" as a way of trying to allay concerns of bond rating agencies. They have already been put on notice with respect to their structural deficit and their seeming willingness to exacerbate their financial woes with a large financial commitment to subsidize the Coyotes. By limiting their longer term liability with the "out clause", perhaps they are hoping that they don't get too badly hammered by the bond rating agencies.
The COG probably also needs to consider the "worst case scenario", which in this case isn't that unlikely. That would be that the RSE doesn't realize the revenue projections, ends up losing an average of $10 million per year (or more) over the next five years, and exercises its own "out clause". At that point, the COG has poured another $75 million into the enterprise, and is left without an "anchor tenant", and has to go through the process of finding a new arena manager five years hence. But a number of the council members will probably not think about that in the presence of Bettman (aka "Oz the Great and Powerful").