Let us assume a miner decides to roll back segregated witness on what is presently the most valuable chain.  
There is a non-zero chance of this happening- one which Core-ists seem never to discuss as a looming concern or even a possibility. In fact, it is generally waived away as BCash FUDsterism.

Given this outcome ,

*All segwit coins become miner property or are hence effectively burned, significantly reducing existing supply
*Reversing the attack would negate immutability


The culpable miners would, of course, have advance knowledge of such an attack and could prepare accordingly- both in trading the markets and hoarding segwit-free coin.

I would like to know how during this hypothetical scenario, from your perspective, miners might decide to support BitcoinSV's doubly forked ledger as the true chain rather than a de-segwitted BTC, when avoiding segwit on the majority chain has been an option all along? It would require something like a total market confidence loss in both halves of the newly split chain for such a switch to make sensible mining economics.

Regarding your current analysis of an extended bear market on the horizon : I believe this would require the above scenario playing out, as we've already seen an 85% correction and time scales relative to previous cycles have been stretched considerably. Indeed, the despair phase may have been internalized by $4 ripple-buying hordes who sold everything at a near total loss last winter and most certainly do not visit this forum.