It's still something we talk about whenever we're dreaming up future features for Anchor. We are still neck deep in the 1.0 release though, with the goal of bringing feature parity as well as a dApp integration layer (sort of like what Vessel uses) but more advanced. Any non-EOSIO chain integration would get pushed out into a 1.X release, after we're happy with the core integrations.
On the business end: the hard part about prioritization with @greymass in relation to Steem is the lack of incentives. It's really not worth it for an organization like Greymass to act as a witness on Steem right now, the pay is just too low compared to the other EOSIO based chains we can participate in. That means there's no incentives that exist currently for us to use in order to devote resources this way. That however may change with HF21/SPS, as we'd potentially be able to be incentivized to add Steem features from a new source of rewards.
After HF21 - I think potentially one of the most important things Steem could do is to move from an individual witness model to one in which organizations are elected. The Block Producers within the EOSIO space are such an incredible driving force behind their ecosystem, with efforts that just dwarf the individual efforts we have seen over the years with Steem (no offense to current/past witnesses, I was one of em lol). I think if Steem had 21 entire organizations, moderately funded, Steem would benefit greatly from it.
RE: SteemDB.com Migration Completed