This is not impossible, it has started. The example is the Lightning Network, it uses the off-chain payment to bypass the real bitcoin blockchain protocol. Advancement may take shape where alternatives will bring faster speed and convenience for people to adopt it more than LN. The L1 is the base for bitcoin, it is the one that must follow the bitcoin protocol to guarantee more transparency and security, but it is slow. The L2 is more scalable to give faster and cheaper bitcoin transaction. But the L2 security is questionable.