Steem-Engine smart contracts will continue to have a lot of use! I trust your team has all sorts of ideas up your sleeves, like the recently released NFT's!
STEEM can support so much great activity, that customjson layer is great, fast, free.... I wouldn't be surprised if we see even more STEEM sub-protocols by the 2022 date you mention.
For 2020 I am building '#STEEM-as-a-service' - keep building!