@Jocke1 - I'd love to see that yearbook signature with Grapes and Blue! As for the national cable TV coverage of the Rockies, I know for a fact that it wasn't just that one game. I happen to have footage of the Rockies playing:
* against Washington on Dec. 6, 1980 on ESPN
* against Minnesota on Dec. 28, 1981 on USA
* against St. Louis on Jan. 8, 1982 on ESPN
In addition, when I check the 506 Archive, I can see that there were these other broadcasts:
* against the Rangers on Jan. 14, 1980 on UA-Columbia (predecessor of USA)
* against Minnesota on Oct. 17, 1980 on ESPN
* against Washington on Mar. 10, 1981 on ESPN
* against Boston on Oct. 16, 1981 on ESPN
* against Toronto on Nov. 6, 1981 on ESPN
* against Edmonton on Mar. 26, 1982 on ESPN
So there were definitely a handful of games during those couple of years. Which makes me even more curious now about my original question of whether the team was relatively overexposed or underexposed (or neither).
I definitely remember reading about the possibility of the Rockies moving to Ottawa instead of to NJ, and how this alternative plan was a non-starter because:
(a) it was determined that the new arena, even if/when expanded, wouldn't be able to generate sufficient supplementary revenue from non-hockey sports/events
(b) it was determined that the Ottawa 67's couldn't survive with a pro team in town (obviously, the 67's and the Senators were able to co-exist years later, so I'm not too sure about this one)