I am not sure if there has been a study or survey on this subject so far, but it seems like the kind of thing effective altruists would create a study or survey to assess.
People I know who are concerned about factory farming but who also still eat meat and are also aware of clean meat are looking forward to progress in clean meat, and intend to buy it as it becomes able to replace demand for meant from animals. In the meantime, they intend to still eat meat from animals, to varying degrees. I don’t think most of them are excusing clean meat coming out soon as an excuse to not worry about climate change, or keep eating meat now, since they were probably going to keep eating meat in the present either way. They have just expressed a willingness to switch to clean meat in part of out significant concern with factory farming when cleat meat becomes as convenient as animal meat.