I know everyone here expects them to collapse under the weight of their failed predictions, but hate to tell you all that it's not going to happen: they GREW after the 1975 prediction, as it swelled their ranks! They are SLOWLY shifting their platform away from setting specific dates, and more on preparing for an unset date for Armageddon.
Look at it this way: Jesus and his apostles believed THEY were living in the last days, 2,000 yrs ago! The BIGGEST FAILED PROPHECY OF ALL, the one Jesus Himself predicted, FAILED. Did that stop any of you from getting involved, or your parents?
The fact is, ALL religions show a gradual shift in position, and we're able to look back 150 years and see the shift that says FAKE! However, I KNOW JWs who've seen the same evidence, and it doesn't phase them in the LEAST. Why? One sad element of the human psyche is that most humans will only believe what they WANT to believe: most are not as open-minded as they think. Some MIGHT see the changes, and they WILL lose the few who are able to think. But for every one lost, there's many more who'll fill in the vacancy. Apply, lather, rinse, repeat.
So I wouldn't waste too much energy hoping they all will see "the TRUE light": they probably WON'T, and will die as firmly convinced of "The Truth" as they did back in 1960 (or 1920, or 1890, or).