in my opinion it is very difficult to mine like bitcoin, because the supply is decreasing every day and mining results are also decreasing.
He's not talking about mining bitcoin, but altcoins. And I agree with him that if bitcoin were to hit a level as high as $30,000 that altcoins would increase massively as a result. I don't know if it's actually going to get there soon, but I think it will eventually.
If you can find an altcoin you have the equipment to mine, I would do it...but only if you have cheap electricity, and that's an obvious point. You don't want to be losing money mining a crappy altcoin that you're *hoping* will go up if bitcoin does.
A better idea would be to find a good proof of stake coin and earn that way. At the very least it doesn't have as high an electricity cost, and it's also a lot simpler to do it. But I do think now is as good a time as any to do either one. Best of luck to you, op.