Well some people claim that future of mining is PoS, why would ethereum go PoS if it`s not like that? Less energy needed, thus you need to buy coin and stake it, every other way of "mining" include buying some GPU`s or asics which can be expensive, than you need to pay for electricity to run machines after which you get some coins, with PoS you directly buy coins and stake them in some official wallet. I`m for staking over the mining, and to be honest maybe its too late for buying some equipment.
It is never too late to start mining but you have to worry about the roi rather; if you don't have energy at low cost, under $ 0.08 a Kw, you will hardly be able to make a profit from your investment, especially if you start from 0.
As you rightly said POS is the future in the crypto, more just and fair, clean, efficient.