You need to keep playing simmer in the duo case. Having one or two devourers out would do worse. The BH comment is assuming 1 = 3 , so it would be 24.An advantage this has over discord and devourers against decks using one element off mark is that novas don't mitigate the effect, so countering it is tricky. There is always sanctuary though.
Indeed, Sanctuary provides a hard counter to the effects of Sear/Simmer.