Lack of proper information or even more, biased information, are curses for us common people and that is the weapon always being used by the powers and their pet media. Professor Rinpoche's views have wonderful clarity and logic but I am sure that official chinese authority can also present an equally appealing version from their side. So, it is not so easy to decide about a state or society unless we also take a biased position (anti-China, in this case) to start with.
Crudely speaking, historically Tibet is being treated as a dependent province either by British India or China, which never showed the strength of standing alone. On the other hand, the place is full of natural, cultural and religious resources which can be really attractive for a ruler. So, exploitation was an inevitable part of this area all throughout. It is almost like how India treats her North-Eastern states, or state like Jharkhand or even Kashmir. If one looks into US, the places of traditional Red Indians are no different by treatment. The story of power probably is always similar. And powers have their own understanding which hardly cares about the sentiments of few of its non-influential citizens. So, an independent Tibet isn't a likely possibility. Tibetan's have to find out a viable, profitable solutions for themselves. Also, it is certainly not a reality that Tibet may become Singapore just like that, they will need bigger supports. Its painful, but a real solution is the only option.