I think that Win, Lose or Draw could have gone longer had the producers not messed around with the scoring system and method of play late in both versions' runs. Here's how two of the scoring systems went:
Original: Each charade was worth $200, but if the drawing player handed off to a partner after 30 seconds, the value dropped to $100.
Late in the runs:
First 25 seconds: Silence (except for background music) while artist drew
Next 5 seconds: Team could guess for $200
Remaining 30 seconds: Team could guess for $100
Steals were worth $50
The complicated nature of the last scoring system, I feel, led to declining ratings. (This system was introduced late in the network run and in the final syndicated season.)