One major challenge that web3 adaptation is facing is its inability to provide for all users
efficiently just like for example in bitcoin,
its mempool is extremely congested and transaction fees are extremely high making
it difficult for it to be accesible to more people out there
Though, depending whom you ask some will tell you Bitcoin is not actually a Web.3.0 asset. There is a reason one cannot see Bitcoin in most of the Web 3.0 services available on the internet, because of the lacking of Bitcoin to support smart contracts in the same way other coins and networks can, specially Ethereum, Solana, Matic... However, I agree with you that one of the obstacles in many chains has much to do with the accessibility, because of the high transactions fees of Ethereum.
I would also like to add that the Web 3.0 has lost much of its reputation because of people tried to completely link it to NFTs, while Web 3.0 is more than the issuing and commerce of non fungible tokens.