Just because CP has not used theming in the past (except for DT) does not mean it might not be appropriate in the future. I don’t think it would work with MF, but CP could decide to build another theme ride (like a dark ride) that would benefit from some queue line theming.
Anyway, the point of this topic is what would you (or I) do with the queue lines, not what is CP going to do. I agree that the MF does not ‘need’ any theming, but personally, I would not mind seeing CP do some theming in the future. I know DT was not a big hit, but if they build a new ride with a concept in mind from the beginning, I think they could do a good job,