Didn't know that about bitcoin. Mining Zencash was profitable with my GTX980 from November until January. I made a couple hundred dollars running my card when I wasn't gaming, last I checked profitability was down to about 40 cents a day on my setup
Two sites you can check if you want to get into mining are whattomine.com and coinwarz.com for checking your profitability
If what you found out about bitcoin is true then our next big boom could be dependent on the development of more powerful and energy efficient mining hardware.
Proof of stake is where its at, about a week after joining Steemit, I stopped mining (happened to be the same week profitability went kaput)