Mining is already profitable, but it depends on the electricity costs which could differ from country to country. Some mining projects already has continued the mining and the payout some others are on the way to do it.
And also, you can mine not only bitcoin but other alts which have promising value in the market. And if you will go solar it will really help a lot in getting good returns. I believe mining will be profitable again and still is, you just need to choose the right options for you.