From an economic standpoint, this is difficult to argue with because there is not much of an alternative. Rebuilding the working class is not possible (nor is it desirable). The service class continues to grow, but it is not likely to create large amounts of wealth for most of those in it. At best, it can reward some talented people highly, while most of the low-paying service jobs like fast food workers, cashiers, shelf stackers, etc. become transitory positions for younger people as they work towards more lucrative careers.
Modern technology and innovation dramatically increase the economic returns to those who know how to use them. This fact explains a good amount of the income and wealth gap we see between the top and the bottom of the distributions. Florida seems to hope that we can keep adding more and more people to the top of that distribution and reduce the number in the bottom part. While I find that plausible, I also have serious doubts about how well that distribution can be changed by adding folks to the creative class or whether we can do so.
But the deeper challenge of the Creative Class is cultural, social, and philosophical. There are several striking social trends that seem to be driven by the Creative Class. One trend observed decades ago by Robert Putnam in Bowling Alone, was increasing social isolation. There has been a massive increase in the number of people living alone - which has gone hand in hand with declining involvement in clubs, associations, and even traditional family life. Florida describes Putnam’s findings: