This. Ignoring future price speculation, there are really three stages of profitability for each person out there -
1) BTC price is much lower than electricity costs. Correct move is to sell their hardware.
2) BTC price is above electricity costs, below the level required to pay back the cost of hardware. Possible moves are to sell hardware, or to mine and hope for the price appreciation. Correct move is to NOT buy new hardware.
3) BTC is above both electricity and hardware costs. Correct move is to buy new hardware.
I'm not sure if Stage 1 is, or has ever been, advisable. Following Stage 1 would have been absolutely ludicrous a year ago or so when 1 BTC was going for a half a cent. Perhaps in the future, there's a chance that Stage 1 might eventually become sage advice, but let's hope not.