This is of course pure speculation and I am not at all sure it will play out this way. We will need to monitor the situation as it unfolds, but it is always good to have a bit of a longer term vision of how things might play out.
What we are currently seeing now is a downturn on BTC to about $1850 and ETH to about $100. When this has been achieved, the buyers will smell the opportunity and be back in for a ride to at least $2700. It is possible in my estimates that we might see a further bullrun up to $4600, depending on whether the activation of segwit is trouble free. ETH will follow back up as it usually does and will outperform BTC in proportion and the flippening will be very close to happening.
When the hardfork of BTC/BTU happens the BTC investors will split into two camps, certainly not 50/50, but still significantly enough that it will lower the price of BTC. It is also extremely likely that there will be major issues connected to this fork, in terms of people losing their money and similar. This will further lower the BTC price and the flippening probably will happen. At this point, ETH is likely to go to at least $1000 and we will see BTC go to below $800.
Cryptomarkets will then start following ETH rather than BTC for a long time and the BTC/BTU issues will have to be resolved before we again will see a rise in BTC or BTU (whichever wins). The ensuing rise will build up over a long time and ETH will start struggling with their own scalability issues. Then we are likely to see BTC or BTU taking over the lead in the market yet again, unless a third competitor is gaining traction.
As a side note, BTC and BTU are likely to at some point start moving opposite of eachother in terms of price. This could create an extremely good hedging opportunity, that should not be ignored.
There is a lot of opportunity for extremely good trades coming, whether it plays out exactly like this or not! Volatility will be insane and long term investors might eventually be left in the dust on some of the bigger coins. It is possible that BTC will never take the throne back after the flippening and then all the talk of $100000 per BTC will never materialise, but rather become a half dead coin trading at a few hundred dollars.
Great argument