I would like to see your data that claims 3/4 of the community opposes invasions. Was there a survey or general poll that I missed? Did you use random sampling?
Stat jokes aside, invasions are common enough that it indicates it is still a popular mechanic. Also, regarding your AI invader idea, Destiny AI is about as intelligent as a dodo bird on a bad day. It would be frustrating for the players on the invading team, and a minor inconvenience for the opposing team. A player forces people to actually take invasions seriously and either continue collecting motes or hide.
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Easy, there are 4 people on a gambit team, typically no one invades unless I do. In general, typically the same person ends up invading purely because the other 3 choose to ignore the invasion portal. So 3/4 guardians choose not to invade.