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Hopefully an online CELTA will not develop so, as you say, "Candidates may register at any time, and will watch videos of input sessions, then prepare lessons to be taught to the trainers' existing classes". A similar approach ensured the failure of non-interactive TV mass educational experiments years ago as in American Samoa. What interactive Internet and Computer Assisted Language Learning so desperately lack is the imagination and technology behind computer gaming and advanced training methods that can teach people to fly planes etc. Unfortunately CALL never gets the funding necessary and certainly not the sharpest knives in the drawer. At the very least you could video a vast number of randomly generated questions concerning grammar, vocabulary, phonological issues such as register, timbre, modulation, volume; and the effectiveness of gestures, eye contact, audio-visual aides etc.