Target or fantasy?Yes, but we know that didn't happen because the 126 MHz clearing target was already announced.
Just a few samples suggests that in order to execute an ATSC 3.0 transition the broadcasters in some larger markets might need 40 channels (around half of what they're after) to simulcast most of the existing broadcasts. In the largest markets, it may not be possible without more than 40 unless they push most of the lower budget operations off the air.
I'm figuring that in order to execute a transition, they'll need at least 40% more bandwidth over and above DTV (and no, I don't buy the argument that stations sharing channels is going to save mass quantities of bandwidth). If they don't give ATSC 3.0 enough bandwidth and force them to pack in 8 streams, consumers may dismiss it rather than voluntarily suffering it for the indeterminate duration of the transition.