Didn't know it was a repost. Did a search in Off Topic and here and didn't find it.
As for THX not being important, that's true in reality. I never make my purchases based on THX support. OTOH, it does make a difference for some Joe Schmoes. It may not really matter, but some people will consider it when buying anyway. Thus I could see it change part of the market, although in what direction I don't know. One can only hope this will mean that more good sounding computer systems will appear, instead of most of the cr@p that's currently available. OTOH, it may just mean that the THX designation will become even more useless.
The one thing I find useful for consumer audio with THX is re-equalization circuits. Some movie tracks are not really remixed for home use, and have too strong a upper treble range, and thus will sound harsh at home, where you're sitting 10 feet away from the speakers. However, it seems that this isn't really a problem with current remixes, and when necessary 3rd party companies have their own algorithms for this which do essentially the same thing.