I mean "becoming an issue" as in, how will this become an issue, exactly? This is going to either be swept under the rug, touted as the "new normal", or will be spun as a positive.
Since most people will not know this, it's up to Paul Ryan and Mitt Romney, in their upcoming debates, to repeatedly state that there 600,000 more part-time workers in September than there were in August, and since U-6 remained unchanged, then the only conclusion is that those 600,000 went from full-time status in one month, or were always in part-time status but were counted as full-time workers. They have enough time to be able to find a way to say this in very simple terms, that the average viewer can understand. Both also need to directly ask their opponent if they will acknowledge that the 7.8% figure represents a major shift in employed persons from full-time to part-time, and suggest this is a trend that will continue in another Obama administration.