I can't say we will see "Bitcoin doubler" since one of the chain/block will have small value and support from community/miners/merchants. But, i think few people will use this chance to "double their money" 
Also, other member found references for BTU price : https://coinmarketcap.com/currencies/bitcoin-unlimited/#markets
It's more that two copies of the same bitcoin will be created (one with segiwt and one without). While it is needed to activate segwit, there should be a way created that completely destroyes the other bitcoin. As, now the limit to the number of bitcoin doubles (even though they're both two different currencies with one parent currency that exists in both of them). Is there yet a name for the other currency that will be created yet?
I think minority chain/block will say their chain/block is the real bitcoin and insist to keep the name. Maybe exchange will use "Bitcoin (SegWit)" and "Bitcoin (non-Segwit) instead if this really happen.
Also, other member found references for BTU price : https://coinmarketcap.com/currencies/bitcoin-unlimited/#markets
...will be launched on the 1st of August. Are you happy with this?
It's more that two copies of the same bitcoin will be created (one with segiwt and one without). While it is needed to activate segwit, there should be a way created that completely destroyes the other bitcoin. As, now the limit to the number of bitcoin doubles (even though they're both two different currencies with one parent currency that exists in both of them). Is there yet a name for the other currency that will be created yet?
I think minority chain/block will say their chain/block is the real bitcoin and insist to keep the name. Maybe exchange will use "Bitcoin (SegWit)" and "Bitcoin (non-Segwit) instead if this really happen.
It probably will happen that it will break into two blockchains, as I'm not sure how much hashpower will be behid the non-segwit bitcoin but all it takes it one core to be mining the currency (on an incompatable) segwit release and then thre will be the separate currency creasted (much less power and userbase behind it but still a separate chain) - and it doesn't take much to get that second chain running.
And obvously, people trying to maintain the original blockchain and keep that goin gare going to say that is it the real one so you are probably right with that way of differentiating the two currencies (based on the aomount of stuff on this forum on its own of people saying that segwit in bitcoin is an altcoin of the original currency).