How successful would a permanent smaller version of Iz*One be?

Let's say Iz*One was not a Mnet group but instead a real group.

Obviously the LSFM and IVE members would be included, and then you probably take 1-2 of Eunbi and Yena. The semantics of this don't matter that much but I would be curious to see what roster people would make.

How successful would this group be? On the other hand, if IVE and LSFM had to replace these members, how would they compare to the permanent Iz*One?