Within roughly one year after November 2021 (i.e., by around November 2022), available cross‑chain developer reports show Ethereum still clearly leading Solana in developer activity.

Electric Capital’s 2022 Developer Report (snapshot as of December 2022) estimates about 5,819 monthly active developers for Ethereum, while Solana is grouped among ecosystems that grew from under 200 to just over 1,000 monthly active developers. (cointime.ai) A follow‑on summary from Solana itself, citing the same report, says Solana surpassed roughly 2,000 monthly active developers in 2022 and explicitly describes Solana as ‘second in raw numbers only to Ethereum,’ confirming that Ethereum still had the larger developer ecosystem at that time. (solana.com) These sources indicate Solana was the fastest‑growing major ecosystem but had not flipped Ethereum on any standard total‑developer or monthly‑active‑developer metric within that one‑year window.

Later Electric Capital data and coverage reinforce this picture: by 2024 Solana does overtake Ethereum only in new developer onboarding, while Ethereum remains number one in overall developer activity, with Solana in second place. (coindesk.com) Since no credible metric in the 2021–2022 period shows Solana surpassing Ethereum in overall developer activity, Sacks’s prediction that Solana would ‘flip’ Ethereum on developer activity within about a year of November 2021 did not come true.