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.
Really, I saw Ethereum has very good transaction speed, since its latest network congestion occured in 2017 with Crypto Kitty and other huge ICOs run at the same time. Update for their blockchain to improve user experience is good, but there is no need to hurry because it will be better to implement upgrade without technical issues.