I have not heard anything about BSC or BNB being more decentralised, and it does not look like there is not going to be any change any time soon. However, talking about decentralised, there are lots of decentralised services (e.g. PancakeSwap, Harvest Finance and Auto Farm) which are becoming more popular, more being created over time. Although BSC or BNB will not be decentralised, many of its services are and will be, so it won't be as decentralised as ETH or other cryptocurrencies, but better than it is now.