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.
What do you mean by "backed"?
Backing a virtual currency by a physical commodity implicitly means that the "backer" has the power to generate coins as he wishes.
Cryptocurrencies don't need any tangible backing, as they're backed by mathematics.
Sure, financial & political institution will try to ride Bitcoin's success, and create their own versions of "crypto" "currencies", but it won't be nor "crypto" nor "currencies".
As soon as people understand the difference between trust and proof, they'll say goodbye to the fiat schemes.