Shanghai-based MMA coach Ramsey Dewey has posted a nice video discussing his understanding of the situation of tai chi:
Think he makes some very interesting points about how the current state of tai chi is exactly what you would expect to see if you withhold the underlying information behind the movements of any art - i.e. it becomes a meaningless shell - and also how a lot of taiji movements can be directly correlated to v practical grappling movements or locks.