"After all, history tends to repeat itself..."
Some of us remember that the building and opening of DIA was at best poorly executed. If history is repeated than the $1.8 billion remodel may not go smoothly and the results might be less than expected.
The remodel/reuse of the great hall sounds interesting, moving all baggage check to one-side and security to the other might work but $1.8 billion for those and a few other changes seems wildly over-priced.