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Outnumbered by who? The people securing the network right now are overwhelmingly doing it on pools. If the blockchain forks, the network not supported by pools may literally be unable to continue thanks to the extremely high difficulty it will have post-fork (as has happened with other, smaller coins, thanks to coin-hopping pools).

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If most of the Bitcoin Core clients, including all the "light" wallet servers like Electrum and Mycelium, and businesses (like Coinbase) switched over, then the bitcoins created by the miners on the "old" blockchain will completely lose their value as they would not have any uses. They'd have no choice but to switch.

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