I doubt that they will be seriously contemplating a change in leadership at this stage in the election cycle.
I doubt also that a poll about styles will have much influence or is even particularly noteworthy. As has already been noted, polls are volatile.
All party leaders will face criticism from within their own ranks over particular issues of policy - its a fact of political life. But Labour do need to start better articulating what alternatives they plan to offer on the substantive issues, that is certainly true.
Difficult to assess his leadership ability as yet. Will only be able to do that once it has faced the test of the electorate. He has had some awkward and weak moments in Parliament, but he has had his moments too, on issues like hacking and energy prices and Syria.
As to the soubriquet "Red Ed",i t was perhaps inevitable given his name. But when I hear people using the phrase, they always remind me of Joe McCarthy and the whole paranoid "reds under the bed" witch-hunts in 1950s US.
When it comes to names, I feel sorrier for Ed Balls. One imagines that almost all serious politicians at some point in their career will have daydreamed about becoming PM; But to know that you will never ever become PM on the basis of your name alone must be a bit dispiriting :)