One of the things that makes medium and large DNN sites difficult is that all the modules create their own output. Some don't even have the ability to customize their output at all.
This is becoming especially time consuming in these modern times where responsive output combined with cross-browser fixing is becoming a significant time drain.
It would be fantastic if DNN could define a straightforward way - maybe via a provider - to allow all modules by all vendors to take advantage of a universal templating ability.
If this were done right I could imagine new templating providers could be created in the future that would work in older modules that support this.
This of course needs to be done in a developer friendly way that vendors would be foolish not to use. The long term benefits to the platform could enormous.