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There of course could be some SMT named, say, STEEEM and inherits all original STEEM setting and even an identical airdrop to all Steemians (excluding Steemit maybe lol) ... Then we will still have a "STEEEM" working ... Well, if people are willing to behave accordingly of course...

FYI Golos have adopted similar model already. They have abandoned Steem code base completely, under the hood it's an remastered EOS fork.
For posting/voting you earn golos tokens, that would be sort of "SMT".
And the system token cyber is paid to block producers only.

How is it doing? Is the user base growing? Do the tokens retain or gain value?

It's probably too early to draw conclusions after just one or two month.
It was a not-so-happy divorce, accompanied with delisting from Bittrex.
The user base is split between Golos classic, which do maintain the original code ( but "forked out" the CyberFund affiliated accounrs) and the new CyberWay blockchain with the Golos application on top of it.
The CMC seems not to be aware of the fork and just do mix data for both chains together.
Anyway the volumes are tiny and the prices are on bottom.
Afaik there's some big p2p interchanges of cyber tokens for golos classic tokens with the exchange rate 1:1 going on now.

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