I've got mixed emotions about HPNA. It was frustrating standing eyeball to eyeball with a subscriber telling them I couldn't make it work with any kind of reliability, but OTOH, there was tons of overtime involved.
Fact is, there's not going to be one technology that works in all cases. A mixed bag of HPNA, MOCA, Wireless, Powerline and running new wire, depending on the situation is going to be required.