I really only see this as (more) bad news for Jeb and possibly good news for Carson and Rubio. The fact that low numbers want them out suggests they might be a lot of voters 2nd or 3rd choice.
Yes, pollsters ask the wrong question. Mr. Undecided is clearly #1 by a big margin. Republicans are in a mode where they name the 2 or 3 whom they could never support and the 2 or 3 they want to drop out (often the same). Then they name the 2 or 3 they prefer...not the 1 that they prefer.
In my conversations, Carson and Rubio are always in the top 3. Rubio is rarely #1. But his tea party (taxed enough already) credentials are solid. The single issue Malthusians on immigration just don’t fly with a majority of Evangelicals, and Catholics, and Capitalists, and Corporatists all of whom are intrinsically anti-Malthusian. The Republican PTA moms are Malthusian but not on immigration. That leaves the single issue Malthusians isolated...and angry.