Ethereum has risen 3,500% this year; Bitcoin is $8000, up more than 600% since January. Will they climb further? The bad news is that the power needs of miners have risen 43% just since October. The global drain on electricity networks of mining cryptos is now 28 terawatt-hours a year, whereas anything above 19 cents/KWH makes mining unprofitable.
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https://cryptodaily.co.uk/2017/11/fall-follow-pride-crypto-currencies/If that would happen and if we're to consider that the process of gaining more bitcoin in circulation would be more and more difficult. Then, you can assume that a fall may happen as it continues to be more difficult. However, I think there can be a change in the landscape if more altcoins will be introduced in the market that would help other coins to not be saturated. The more coins available the better trading practices will be because there would be more options.