While not a failsafe method, lots of newer cryptocurrencies use proof-of-work that is "ASIC-proof." This means that CPU and GPU mining will remain profitable, t

While not a failsafe method, lots of newer cryptocurrencies use proof-of-work that is "ASIC-proof." This means that CPU and GPU mining will remain profitable, theoretically preventing the degree of centralization seen in Bitcoin. While this doesn't remove all risks (e.g. an incredibly large mining pool), it is certainly harder to disable thousands of independent miners than it is to do so to a single centralized operation.