I would find it hard to imagine anyone would want to leave just for having Superman go to his normal look and power set. I mean, that's what Pak and Kuder were doing (and excelling at), well before this anyway. And Superman's the one title that's set a bit in the past anyway so Yang's been working with just that set up to this point as well. There's really nothing to indicate anymore that this idea was the baby of any one guy or creative team set that might upset them to see it end to the point of wanting to leave. It probably would have never came about if DC hadn't mandated changing stuff up for the DCYou initiative in the first place. Thus its hard to see anyone being particularly married to the idea now.