No Bitcoin is the real chain.
One is BITCOIN
One is Bitcoin Cash (a new altcoin, not the REAL BTC)
The Forks that Survives is the Real Bitcoin , and the survivor will be Bitcoin Cash.
Plus on segwitcoin , if everything goes to G.Maxwell's plan, you will only use LN ,
You won't be able to afford Onchain transactions,
Offchain transactions are not bitcoin , only Onchain.
╥Aztek
To simplify things, they are all going to exist, however, there might be major n minor chain of bitcoin. With miners hopping between chain, its fluctuations like crazy. There is no unity.
I really think it will start a new wave of coins that are built to challenge the chain leaders. Look for a Scrypt coin to overtake LTC, or an X11 to take over Dash. We already see a lot of chain jumping among miners on those algos, and once they get smart and implement an EDA similar to BCH they will grow.
LOL, that happened a long time ago during the altcoin explosion. 2013/2014 was probably the peak. Dogecoin came out and challenged LTC. Darkcoin came out with X11 and then there were a million copycats. There were pools switching back and forth from Doge to LTC to other Scrypt coins from block to block. This time saw a lot of innovation in difficulty setting algorithms, culminating in the "Gravity Well" that ended up in Dark because Dark (now Dash) kept getting screwed over by hashrate entering and leaving the coin depending on what was trading up that day.
When it first came out, Doge actually had a "random" coinbase payout (mining reward). I think it was something like anywhere between 0 DOGE and 1,000,000 DOGE per block. But the thing is, the reward was determined by the hash of the previous block. One Scrypt multipool figured this out and only mined the high payout DOGE blocks, and mined LTC the rest of the time. So they ended up with a lot of the high reward DOGE blocks, while dedicated DOGE pools ended up with the crappy ones. After this was found out, the DOGE developers switched to a fixed mining reward.
I believe similar things happened even before Scrypt mining became popular among alts.... reportedly Namecoin and BTC fought over SHA256 hashrate for a while, before merged mining was figured out. (It's a shame that more miners don't merge-mine Namecoin.... it doesn't add any difficulty or time, and it can provide a little bonus for the miners.)
So all of this has been seen before, but obviously not with the stakes as high as they are now.