Some would say it looks as though you already have
While I do see (and understand) Rich's frustrations, and I do agree that people who solely download music for free and have no other financial interaction with those who make/produce that music are essentially thieves, I also think that we're seeing a transitional period.
I've worked in the Internet industry for about 15 years now and very well recall the prophecies of High Streets becoming deserted as far back as prior to the new millenium. Obviously, it's not really happened - yet - although, as Phil points out, the shift may not have been massively dramatic but the nature of the High Street has changed and is continuing to change. Of course, this is also largely down to the big supermarket chains now selling CDs, books, games, DVDs etc. from their out of town locations.
HMV knew that their survival, like that of so many bands, would only come via the live music sector. Much as nobody can deliver a decent cup of coffee via the online world, nobody can recreate the experience of attending a live show. Let's face it, live albums and DVDs are nice oddities but they don't come close to actually being there. This (and the associated merchandise sales) is where the financial future of bands and music really lies. Swindon's just about waking up to the fact and hopefully MECA will firmly seal the deal.
I reckon we'll end up with the supermarkets and online retailers continuing with their music sales but a new type of presence for music will appear in our towns. I think we'll actually see a return of small, independent record shops, mainly selling second-hand stuff, merch and possibly tickets for local venues. Hopefully, anyway.