If Bitcoin was Proof of Stake or at least PoS+PoW hybrid, we wouldn't care if PoW miners are chasing short term profits, because that's the nature of PoW.
on top of it we always have the spam attack issue with bitcoin and block size is still 1 MB with no SegWit since it is not yet activated.
Yes, this is what's going on. They are pulling ahead mining rewards on BCH to shower money on the miners, causing the BTC blockchain to suffer. There are virtually zero TX on the BCH chain, so the miners are not serving customers (actual TX), only serving themselves in a short-sighted way, chasing the carrots that the BCH gang are dangling.
This is a good example of what happens when miners incentives are out of alignment with what is good for the bitcoin ecosystem, and how hostile attackers can game the system to attack Bitcoin. How many newbies (or even more experienced users) complaining about high TX understand that it is a result of people who have separated from bitcoin, and how many are blaming Bitcoin itself or its devs or community?
Well, you are brave! The chances of persuading people to switch to POS will be even less than persuading people to go for Segwit2x. Too many vested interests who want the status quo to remain.