"Mark my words here. There is a really good chance coinbase is going to call 2x bitcoin and that will make it the new bitcoin.. It will be the coin new users buy. Miners will move to the more expensive coin. And core devs and nerds that understand the beautiful power of a true crypto wont matter."
The longest chain is real bitcoin. So, if 2x will be the longest - it will be Bitcoin with all necessary marks, nodes and other.
Only way to avoid this is to vote your hash powers. Oh, sorry i forgot that you don't have it. You're not miner. So, why you 're crying? You gave voting power to pools and they want 2x. You are guilty for this.
Bitcoin is PoW system, so you must have mining powers to do any decisions.
"The longest chain" is a pretty common false argument by forkers as it tries to mix up two concepts - consensus within a protocol and community consensus on what chain is Bitcoin. The first means that the longest chain is the valid chain - this is just the basis of how Bitcoin works and how all nodes are in sync but when there's a fork that changes protocol rules, it doesn't matter if how many blocks the new chain has, if people don't start switching to that software it's as if that chain hasn't existed. Miners can't dictate to users what chain is Bitcoin, in fact it's the users who can create incentives for mining by trading coins on open markets.