I foresee a collapse of BTC value when the first large financial institutions release cryptocurrencies of their own, which are actually backed by tangible assets like gold or by fiat currencies. Those will not be ideologically appealing to most people who post here, but the business model makes perfect sense. The fear that the public and media have about BTC is that it is an attempt to create wealth out of thin air. Having a trusted bank issue individual coins representing actual assets will allow them to be more valuable than BTC is today, making them more attractive to mine. These bank-backed cryptocurrencies would look to many like the 'best of both worlds': the guaranteed value of a traditional bank note with the transparency and irreversibility of distributed block-chain logs.