The challenge I see with BTC is all development is seeking to make it a more efficient tool for financial transactions. Thus, I do not see it ultimately being a major part of Web 3.0.
As for your question, I think the answer is most of the big names. BTC, LTC, and ETH all have scaling issues. EOS appears to be able to handle the traffic from a technical point but has other issues like the cost of transacting.
We will have to see the final roll out of Cardano but they look like they will be able to scale.
One advantage to Steem is the bind Steemit Inc found themselves in caused them to approach the scaling/cost issue.
It puts Steem in a fine position going forward.
Posted via Steemleo
Efficiency is not Bitcoin's core value proposition. Security through decentralization and massive mining power is. It was intended to become digital cash but it turns out it works much better as a store of value, which is one aspect of money fiat sucks at.
Bitcoin must scale through second-layer solutions such as the Lightning Network.
Steem is built for a totally different purpose. It's an app-specific chain to serve as the backbone of Web 3.0.