Let's keep replies respectful here -- no need to throw around any derogatory terms.
While I would certainly agree that buttons are always a potential failure point (after all, Apple did finally do away with their iconic physical Home button), it's clear that any non-mechanical replacement would have to work much better than what HTC tried. And it would also have to remain friendly to those who may have accessibility issues (e.g., the Active Edge squeeze would not be an ideal replacement, since some people may not have the hand strength to utilize it).