Who is "they"? Why would they be scared of it? Did you buy more Ethereum after seeing this article? And if you did not see this article you would be still be buying Ethereum, but "less" right?
“They” is Bitcoin holders, of which I will no longer be one by Dec. 1. Proof of work makes no sense anymore and proof of stake will take over with the launch of Ethereum 2.0 in 2022. I’m unbiased, this is just the market and math I see coming.