Pair expressed his belief on the Medium post’s that he believes Bitcoin does not need a fixed limit, though that would create uncertainty for miners.
Pair believes there can be a “hard limit” – the maximum block size – and a “soft limit,” which miners could increase or decrease if they want. The soft limit will be the default limit for miners to create blocks. As Pair lays out in the fourth and final essay in a series:
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At BitPay, we will experiment with this approach. We will perform back testing to analyze what impact various settings might have on historic blocks. We will also analyze behavior under extreme circumstances and critique it from a game theoretic perspective.
https://www.cryptocoinsnews.com/bitpay-core-coming-soon-for-bitcoin-blockchain/