I think ASIC will start the demise of bitcoin from the consumer point of view, if you cant mine for BTC why pay a premium to buy them when a debit card and amazon will be cheaper for any LEGAL goods you might want to buy. Speculation and slightly dodgy transactions is all people will want BTC for.
Why cheaper?
If you cant mine for coins you have to buy them, people selling BTC here in the UK charge a premium (up to about 10%), bank transfers to exchanges are pretty much non existent.
an item costing £80 on amazon is most likely going to cost more somewhere else e.g (insert Btc store here) due to lack of purchasing power.
And for newbies, the hassle of setting up the wallet, finding stores, obtaining Btc (no easy task)
Everyone can afford a GPU, not many can afford 2k+ for asic.