Considering certain factors, you can decide to mine ethereum or not. Ethereum is being hugely traded on different exchanges. The value may rise soon. However prediction is just for prediction only. It will not be related to mining.
The factors you may think about is
1. Electricity cost, if you're going with free electricity or solar like energy systems, you can save a lot of money. So it will be profitable.
2. Difficulty and your hardware means your rigs capacity. If you have a farm of rigs, you can beat the difficulty and make much more coins.
Even with no free electricity, you can make profit on the mining of Ethereum. You can sell your card later when it becomes less profitable.