All the experts, including the numerous researchers who work on and have contributed to ETH 2.0, say Ethereum can scale. Any one with a passing familiarity with the cryptocurrency space knows that.
The only people who claim Ethereum can't scale are those who claim Lightning Network can scale, and have aggressively silenced any one who says otherwise within the Bitcoin space for the last six years, while declaring themselves to be the only experts on the issue.
Who cares who claims what? It's more important to hear the reasons behind the claims. Vitalik makes excellent points about tolerances and safety margins needed in decentralized networks like this. People who call for increasing the key parameters almost never acknowledge the fact that things aren't as simple as what some fast machines can process in ideal conditions.
