Yep there is no floor under the bitcoin price, but there is a roof over the mining cost, which is the price, modified by the usual stuff like speculation in mining equipment.I don't understand how you're thinking.
If the price goes below current average mining costs some miners will stop mining and the ones that are still profitable will get a larger share. But it will take more coins to pay for their expenses, so more coins will be dumped on the market.
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