Every time SN testnet tries to become decentralized, it either crashes, hangs or lose data. So no, it is not decentralized yet.
The question is “what prevents SN from working?”. No precise answer for it is a problem. Either technical or social.
If it was possible to evolve “v6.2” into working state with just bugfixing, then why not to do this?
If it is not possible without DBC, which means previous approach completely failed, then why no one talks about it?