no the bsc blockchain will not remain the best option is only a temporary solution until the eth fees return to be reasonable then all the projects and users will return to the eth blockchain
I don't think so, because BSC developers have never played around in developing their network systems so it would not be feasible if this BSC was considered a temporary solution, because BSC is a mainnet that will clearly compete with Ethereum even though at this time it cannot beat Ethereum.
If BSC wants to beat Ethereum, they need to be more de-centralized. As long as BSC is centralized network, it is of no threat to the ethereum. People prefer decentralized network over the centralized ones and that's the major reason both bitcoin and ethereum consists of 70% of the total market-cap.
I don't think most of people who just using crypto as a way to make profit care that much regarding decentralization, the proof is exactly why BSC could become popular despite many other smart contracts blockchain already exist though I know BSC offering the simplicity to migrate from ETH blockchain to BSC's but doesn't justify why people choose a newly created blockchain that's centralized over the decentralized ones but it's different with developer that truly offers something and not just copying other swap platform like todays trend. they usually care a lot about whether the blockchain is decentralized or not since they are thinking long term and not just trying to grab the free money and hopefuly such projects are the one that could increase the overall market capitalization of ETH.