Why bother?  Taiwan couldn't build a military large enough to deter China and the very act of doing so will only just antagonize China and increase the likelihood of a Chinese military operation against Taiwan.

No. There is virtually zero probability of any nation standing up for Tibet with anything other than a few stern words.

As I said, the US-led boycott of the Moscow games in 1980 was a waste of time and effort as was the Russian-led boycott of the 1984 LA games. 

These Olympic boycotts are useless for politics and only hurt the athletes.

Okay.

Indeed.  As I noted above, the pro-Tibet protesters do not appear to have 'political protest' as their primary goal - the goal appears to be one of disruption.

Intervention has in some cases lead to rather positive results. Not all intervention are done trough military means, and some military interventions actuall payed off.

Personally the detterent of Nukes from China will probably ensure no military intervention takes place. If you want to put pressure on China you have 2 options, massive worldwide supported economic boycot (which will probably be impossible looking at China's current economic might). Or offer/give them something and ask something in return, I read an entire paper regarding the ineffectiveness of economic boycots on China.