If Mining BTC Even with free electricity cannot pay the mining equipment in a year, that will be the doomsday of BTC, 2000$-2500$ is the limit.
Base on fundamental analysis, bitcoin will dump in price before the end of this year but it will definitely not dump to the price range you mentioned and you unable of mine profitable wont be the reason either.
However, mining profitable required some outstanding mining equipment and for you to get one and how to do it go
Mining Section for better help.