As a designer it gives a larger area for product or sponsor identification. I believe that the change should not be made at this time. I think the Next Gen cars need to get on the track and get fan support before such a large visual change. There are too many changes already that the hardcore fan will object to (a center lug nut versus five, etc.). This will give fans another thing to say they don't like. I believe it looks too much like many international series.
If it were me, if the decision was made to move the numbers I'd go halfway between what I've seen and the current positioning. That would give more sponsor billboard without being very noticeable to the average fan.