By implementing the above, upon Classic activation, each Bitcoin will be split to ClassicCoin and CoreCoin. Each coin will be transact-able separately and will have a different market value. Most of the exchanges will probably support both Chains, hence each Coin will have different market value based on supply and demand.
Lesson learned from the Classic coup attempt or why Core needs to prepare a GPU only PoW
Guy Corem

I don’t think this is advisable, viable, or wise. It will probably kill Bitcoin. And of all the bad things that could happen to Bitcoin, this scenario is up there with the top 10.

When it comes to currency, there can be only one. Multiple fiat currencies arise from the existence of competing nation states and regulatory pressures that interfere with the market’s desire for an efficient medium of exchange.

This will confuse users and undermine consumer confidence in Bitcoin.