LIke I said in the OP there will come a day when a new user will buy bitcoins (say locally for cash) and when he goes to use them at a business or exchange or where ever they will be rejected. Not 100% of the time...but it will happen and we all know how the media today loves to jump on anything bitcoin related that is negative.
For the millionth time this is only true if you choose to do business with a company who does not actually accept bitcoin but fiat. If you happen to transact with a user or a company in a peer-to-peer manner on the Bitcoin network
there will never be such a thing as "transaction rejected".
Yeah that can be debunked as well.
Say country X implements law Y that says everyone who uses bitcoin can't accept bitcoins from the List Z of blacklisted addresses.
If A (only one) person chooses to adhere to that regulation, and someone tries to exchange between P2P ...and they are afraid of their government cracking down on them...it can and will happen. Your "never" presumption goes out the window.
You ignore the possibility that P2P transactions could exist where you are required by your government to run the paying address through something built on top of bitcoin (even just a website) and it spits out a POSITIVE (GO signal to do transactions with that person) or NEGATIVE (stop signal to not do a transaction with that person).
It is possible.
Governments will think of ways to control every aspect of a market if they can.