In getting rid of tapes, I came across three episodes of Blackout I haven't seen in a while, and I enjoyed them. Granted, I'm not the average audience member from 1988. I tried playing along at points, muting the TV for 20 seconds, and listening to the blacked-out portion. No other show was asking its viewers to do that much legwork to participate. Going from 84 words of gameplay & two Winner's Circles on Pyramid to (up to) 9 words & 1 endgame on Blackout had to be like replacing Jeopardy with Deal or No Deal for some people.
In the four months prior to Blackout's premiere, Pyramid averaged a 15 share against Sale, which was pulling a 13. When Blackout debuted, its first two weeks averaged a 12 share to Sale's 14. The remainder of Blackout's run averaged a 9 share to Sale's still-steady 14. When Pyramid returned, it averaged a 12 share to Sale's 14 share for those final 13 weeks. The returning Family Feud was neck-and-neck with Sale for the next 28 weeks, before pulling ahead during Sale's final months.
If that looks a little odd to you, regarding why CBS would want to get rid of Pyramid: from May to September, Pyramid was losing to Sale of the Century - at some points, with Sale having a 14 share vs. Pyramid's 11 share.
-Jason