Of course it is. No one controls it and it can't be destroyed. The concentration of hash rate in one country is something that might need to be addressed in the future but the currency functions just fine.
I cannot agree. This time "People in that room represented over 50% of the worlds bitcoin miner production". How about next time? 75%?
If "People in that room" make a decision to do short for bitcoin, and they may hold short on exchanges, what can we do?