Most democracies have independent commissions that are put in place by the legislature without any citizen ballot initiatives. So this issue ought, in principle, to be irrelevant. I know, of course, that the reality is different.
The idea that "the Legislature" should be interpreted to include a citizen referendum seems very dubious. In the original constitution, prior to the 17th amendment, the House is described with the following text:
while the Senate is described thus:
It seems pretty clear that the authors distinguished "the People" from "the Legislature". That's why the 17th amendment was needed.
