Well, at least for MixNine it is not true - the group simply did not form in the end, so technically they did not flop, lol. I would wait before making sweeping predictions though.
Lol true.
Ofc, anything can change, something can switch and this group can become really popular. But all I want to point it is that as of right now, the show isn't really getting all that much traction, both ratings-wise and engagement-wise.
Most people who want to watch a survival show are just watching SWF.