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At the beginning of Season 11, there were 44 games that were in active rotation with eight games having been retired at this point: Bullseye '72, Double Bullseye, Double Digits, Mystery Price, Professor Price, Finish Line, The Shower Game, and the Telephone Game. It's a shame Hurdles and It's Optional were retired since they were by far the longest active games to have ever been retired up until that point, as all of the other games previously retired didn't even last a season, and in many cases, only lasted weeks. Both games became the first to be retired after 4 1/2 years, the longest stretch without a retirement that wouldn't be matched until the '90s between the retirement of Bump in 1991 and Split Decision in 1997. With the latest game currently in the rotation, Walk of Fame, we're currently up to 46 now, and will continue to grow to 50 games at the start of Season 14 with the premiere of Bump before the retirements of Trader Bob, Walk of Fame, On The Nose, and the Balance Game in late 1985 will revert that total back to 46, and won't hit the 50 game mark again until a brief period at the start of Season 17 with Spelling Bee, before hitting a fresh high as the '80s drew to a close at 52 games with Super Saver, MYM, and 2 For The Price of 1, with Add 'Em Up becoming the 15th game to be retired.
Still, considering that there were just 20 active games for the first two months of the hour-long era proved that the variety was missing until the plethora of new games released between 1976-1983 really helped to make the show what it is. That said, regarding a lack of new games, just think of it as an overfilled bookcase with extra books piled on the floor in front of the bookcases; there's basically no more room to grow unless if they retire certain games to make way for more. Still, I find 50 games the "Sweet spot" in terms of a balance of familiarity and variety.
That said, the show had to compete with the very popular Wheel of Fortune at the time, and continued to do so until Pat left the daytime show. Afterwards, while overall ratings may not have changed too much, the gap between it and #2 (Family Feud) continued to grow until Price was the only game in town.