Let's assume you're 100% correct, KM. CBS could have rescued the situation by locating a smaller, more intimate theater for the Colbert show to originate in, then sold the Ed Sullivan (which they intend to do anyway). They could have trimmed the house band by a couple of musicians. Shaved the writers' room by a few comedians, trimmed the other departments each by a little, brought the budget into alignment with the economic realities. Colbert is still the #1 late night program in the 11:35 slot, and you don't kill off the golden goose, you give it a haircut (or would that be a feather fluff?) to bring it back into profitability. The idea that some third-rate show that parachutes in from Dayton (or wherever Byron Allen produces it) will do anywhere near as well is exposing CBS to a huge risk.
Once you accept that premise, it becomes difficult to dispute that CBS saw Colbert and his entire team as expendable , the quid-pro-quo for the Ellisons to score their white whale, the much bigger prize.