I am totally for this. This suggestion is not about laziness it's about fitting more commands into a block, thus saving space in the world. Full support
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To those of you suggesting new uses for Emeralds in the suggestions forum: Emeralds have enough uses. You can trade with villagers to get diamond armor/tools/weapons and enchants. Stop suggesting that Emeralds are useless, and learn to play Minecraft. Thanks.
You know you could always just make it set /scoreboard at 1 or whatever and then get a seperate command block further away to test whether /scoreboard is above a certain score and then trigger other command blocks if it does.