When looking at the wider question of imposing visitor number limits at WHS around the World I discovered that it is intended to do so at Mogao and, moreover, that a "state of the art" Visitor centre is nearing completion -due to open next year (but already late due it seems to lack of funding which is a surprise).
We visited back in 1996 and already found the "visit experience" rushed and limited (
http://www.worldheritagesite.org/sites/mogaocaves.html ) - numbers must have increased massively since then. No doubt something had to be done.
What is being done is to build the new Visitor Centre near the airport some kms away from the caves. provide Virtual Reality replicas of the caves ... oh and bus people to and from the caves from there! I provide some links below including a PhD thesis (Texas University) by a guy who had worked as a guide at the Caves describing the recent visitor experience, issues arising and the planned new facilities and system - it appears there will be a computer based Visitor management system which will schedule/control the flows and times at each Caves. I rather liked this phrase in his paper
"From my understandings about visitors, the purpose of visiting the site is to see the authentic, original caves. Most of the visitors would not be satisfied with a short visitation in the caves and a simple introduction"!! You're so right - but the direction of travel for visitor management around the world seems to be to reduce somewhat the main aspect of a visit to the real thing to a mere episode within a series of controlled activities.
Link to plans for the new visitor centre
http://www.friendsofdunhuang.org/newsletter/article.php?lang=en&id=080103Links to a recent (May 2012) progress report
http://www.best-news.us/news-4254716-Mogao-Caves-visitor-center-significantly-shape-t he-post-construction-funding-gap-Yuyi.htmlhttp://www.chinadaily.com.cn/bizchina/2013-05/18/content_16509215.htmLink to the PhD thesis (also contains some good background infor on the history of the site and many of the caves)
http://repositories.lib.utexas.edu/bitstream/handle/2152/ETD-UT-2012-08-6370/DU-THESI S.pdf?sequence=1