I certainly think AGI is possible. I just don't think Word2vec, RNN's, i.e. stuff from the NLP textbooks, is in the same ballpark as what it will take to achieve.

Edit - To be more clear I also agree AGI could be possible with text as the only input. I just think we need a new paradigm. Ostensibly AGI is meant to mimic human intelligence (minus the pitfalls), so IMO, the best approach will be that which mimics the underlying processes of human intelligence - not just the results. Traditional statistical NLP methods will probably have some role in this final system, but not the heart of it, as far as mimicking intelligence by mimicking intelligence's underlying processes goes.