it doesn't matter if how many blocks the new chain has
Yes, the point that matter it's hashrate power. If most miners will swith to bitcoin 2x - bitcoin 2x == bitcoin.
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.
Who is "people" ? Average user uses online wallet and he don't care how much will be block size.
Who can really affect to miners is business like exchanger nodes. Only they and noone else.
I see that many people here can see problem with miners, but they don't understand reasons of this problem. 'Cause they don't want to learn any technical issues.