I dont understand. If btc falls to near 2500 levels, u gonna take a few years to break even or never break even. It will probably never occur as new miners come out by then.
If price drops that much, miners will switch to other coins. BTC difficulty will come down and it will be profitable. That's my assessment. We will know for sure when it actually happens.
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nowadays it is very risky to buy a miner and think ROI with too much volatility and uncertainty where I think many are buying a miner for the fun of mining more than an immediate investment and ROI or to get rich. But buying 1 miner and hoping to make profits is highly unlikly and uncertain.
People who already are mining would keep on adding more miners with time to keep up with the difficulty as they capable of purchasing and adding without worrying much about the ROI since their mining operation is already in place.