People may have different reasonings in favor or oppose but IMO anything is better than just waiting for Ethereum 2 for a year or two. It would be beneficial to both of these coins as they are not the competitor of one another.

maybe it's the best step to overcome some of the problems that have been experienced by ETH users. until ETH v 2.0 was launched, BCH was an escape from making the best transactions because of its fast and certainly low-cost service.
because now ETH is down because of the decline in ETH prices in the crypto market.

I think this is the best thing to do now till ETH upgrade time comes if the team are sure they can handle the experiment then they should go ahead,we all know how cheap the transaction rate of BCH is so its really not a bad idea

that is the stupidest thing that i have ever heard come out of Vitalik!

as a standalone blockchain/network you never want your coin to rely on anything else. specially when you are claiming that it is "decentralized" (although ethereum is far from it) and using another altcoin's blockchain is like relying on that for survival.
not to mention that BCH scalability is even worse than ethereum's because it is a copy of bitcoin and bitcoin by design is not supposed to process spam transactions that a token like ETH has.

the funny thing about ethereum team is that they have been promising solutions for scalability for at least 3 years and every day ethereum blockchain grows more while nothing is changing and they have not delivered anything yet

that sounds weird for me and hat about so many solutions that already created by vitalik in the past? It sounds like vitalik will become the next team a part of roger and jihan wu lol. I guess we need more information about that. Seriously this is an unexpected thing.

Yup, this is scary if it's for real. Is Ethereum in such a trouble they have to team up with BCash?!
This can be a super news for BCash, or can be just something to rise BCash price.

I didn't find this written on Vitalik's twitter, so for now I'll threat this only as rumor.

Low scalability is a nonsense phrase that altcoins love to talk about. So what if you have bigger blocks and faster TPS? Eventually,,, you have to scale if you have more txs than your network can handle and that is a sign of success! BSV or BCH or whatever will never have this problem not because they can scale but because they will never have the success needed to scale.

AFAIK, higher scalability and higher TPS means faster transactions. Transaction speed is the problem Etherum is facing right now.
But I too don't believe depending on another blockchain would be beneficial to Ethereum. They should better hurry and bring up their updated blockchain.

Sometimes Vitalik looks like Dr. Stein trying to kill his own creature, I would understand that he said that only if he were joking. If Ethereum needs a temporary solution to their scalability issues, they must find it by themselves and not relying on another project.

Well, it is good he is doing this only on short-term basis. BHC can actually be useful short-term but I doubt it will be a proper Blockchain long-term.
Any true believer who doesn't understand what BHC is trying to offer will easily jump ship. 
I have no doubt in my mind that the cryptocurrency will not be a proper Blockchain long-term.