I think Bitcoin will Dead BTC
If every country Government Banned Local Exchanges from Accepting Deposits.
Then, there will be no more people using Bitcoin because they might be arrested in this condition.
If there are a new cryptocurrency which is more profitable, and Government Approved Legally In the future.
I agree with your first statement but I don't like it to happen, the online users will protest and make a petition. On your second thought, its impossible because how can we trust a new coin if it is not yet well establish unlike bitcoin that already running for a long years even bitcoin is not approve by the government legally, they can't easily destroy it.