As I have said before, the question is not whether it works or not but it works against what standard. For eg. what is the need to call market tops or project turning points? Money is made in the NOW riding the current impulse if one needs to use the EW term for it.
Again on the question of a "Theory" working, there are hundreds of Mutual Funds that claim FA works but not half of them can beat their benchmarks unless its a wide bull market. So the question again is...The theory works against what standard. One can claim any theory works - CAPM, MACD, Financial Astrology because if they dont then one can do the exact opposite to make it work.The key term here is randomness, anything can work at any particular time.
Another thing is hard data, none of the EWers have collected any basic numbers something as basic as Forecast Error or %Accuracy.Human mind suffers from "restropective distortion", all theories seem to work in hindsight.
Just as a reference, I am not new to forecasting using EW and Gann however I wasnt able to gain any probabilistic insights using these theories because it is utterly determinstic ( One hypothesis is replaced by another if the situation changes )
http://epiktetos13.blogspot.com/2006/09/nf-daily.html
Its a amusing diversion to label waves etc but IMO it adds zero value to trading, distorting the NOW.There are much easier to implement and pragmatic theories than EW esp. for newbie traders given the learning curve of esotreic theories.