I am sure that the presence of Western tourists, with camera phones and internet / phone access is the only reason anyone knows quickly of the rioting. Whether the Chinese will review tourist access to Tibet is a moot point. Shutting down internet and phone access I fear would be relatively easy.

Secondly there has been reporting that the native Tibetans are being outnumbered by the incoming Han Chinese. I recall Tibetans may already be in a minority.

Third, any insurgency needs weapons, preferably firearms and I doubt if Tibetans have access to them.

Once the tourists are gone we will rely on press reporting (unlikely) and those who exit carrying stories.

Sadly Tibet is a lost cause and I've not even thought about power politics, Olympics etc.