Schnorr and Taproot also considered as scaling solution, but a minor one.
Thanks for your comment. I would describe Bitcoin scalability problem as (correct me if I am wrong) - inability to process a large number of transactions (like for example VISA). which result in impossibility to implemented Bitcoin as normal daily payment method for large amouth of people.
The real problem isn't bitcoin inability to process large number of transaction, but inability to process large number of transaction
at reasonable cost.