What if this time the value of BTC and B2X on both chains doesn't increase, but they both suffer because of the rivalry? If history always repeated itself, wouldn't we all be rich?
It looks to me like I'd rather stay in alt-coins this time around, and let the feud pass on my portfolio. The market clearly looks overheated. Who else thinks this could end badly when looking at price development?

Definitely could end badly if improperly managed. But that seems unlikely as all the major vendors, exchanges and wallets have committed to moving on to S2X. The market is on fire right now, and it will rapidly be put out after the fork. May go down to $5k during the correction.