I would LOVE to have some new servers without access to cash shop conveniences for TBC Classic. I think there are actually more people who would move to those servers than Blizzard might realize though.
We have an open threat right now with just such a request: A Formal Request Thread for Fresh/New TBC Servers - #1573 by Ardus-thrall
I agree there may be some downsides to new servers but I think there are more positives to the concept myself. 
Thanks.