The Eye Shield was used as a "break" between the sets, they could show the Dungeoneer walking down a walkway, this would I assume give them the time in the studio to make a new set up
No in fact. Most players who were on the series say that the breaks between filming scenes were very long, often upwards of an hour. It's not clear when exactly the bits with the advisors watching the Eye-Shield sequences were filmed, but they definitely weren't nearly long enough to cover the change of set lay-outs and chromakey images.
although really I think the pathways were set, regardless of which door they took.
This is probably true. The series was good at 'bluffing' variation, when it seems very likely that most quests were far more linear than that.
As to answer your question, No, I think the eye-shield is/was a good device and should remain even in any upcoming remake (one can hope cant we? )
TES is used very widely in the KMRPG cutscenes (although whether they will ever be released is a big sticking point). Personally, I'd rather see the back of TES, but it does give the RPG a feel of authenticity.