The quest for a workable Bitcoin scalability solution is still ongoing with developmental efforts in protocols like the Lightning Network and Statechains.
As the largest cryptocurrency by market capitalization, Bitcoin’s (BTC) effectiveness as a medium of exchange is still a matter for debate. Unlike fiat money that is inherently infinite in supply and must be managed by a central bank, Bitcoin is akin to gold in that it is commodity money with a finite supply of 21 million.
However, the supply cap is not the major stumbling block for BTC as a medium of exchange, but rather, the transaction throughput. While Satoshi Nakamoto envisioned Bitcoin as a peer-to-peer electronic cash system capable of facilitating online payments without a central counterparty, seven transactions per second on average is hardly the standard for scalability.
Reference:
https://cointelegraph.com/news/searching-deep-the-quest-for-bitcoin-scalability-through-layer-two-protocols