ETH options analysts suggest limited upside potential for Ethereum (ETH) price beyond $2.6K.Recent data from a decentralized finance (DeFi) options protocol shows more skepticism towards ETH performance.The number of Ether calls sold is almost 2.5 times higher than the calls bought, indicating capped upside potential.Ether Calls Sold stood at 34.5% while Calls Bought stood at 15.5%.