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By collapse you mean go to zero? Or just lose dominance? I think there room for BTC even if it gets replaced as the #1 crypto. BTC's 1MB block size which has led to increased fees is definitely a major issue. There are a lot of other coins that address this issue and I do believe we will see a new #1 crypto relatively soon (maybe in 2018).

It will never go to zero but I think it could come down say 50-90% in the next 10 years. From what I have read bitcoin is not very good compared to other cryptos.