Bcash cost of production (difficulty) is now being slashed by 20% per block for the next 6 blocks. Expect miners to follow cost of production slavishly. Forking guys have no idea what they have unleashed ... it will become apparent soon now.
Yes, the existence BCC will destabilize BCT mining.
So you have been a part of knowingly destabilising bitcoin mining? Neither chain will be stable, the 'hard-fork now!' camp have just stupidly devalued any investment they had in bitcoin (BTC or BCH) ... unless of course you actually work for govvy agents or other actors aiming to do exactly that which you admit to.
Merged-mining is one way BCH can gracefully admit their gargantuan fuck-up and save face (seems they spend a lot of time doing that). You weren't around when we already tried these 'experiments', it's not a pretty outcome. Bitcoin will survive but the credibility of the idiot loud-mouth crowd doesn't stand much chance (not that they had a lot). Enjoy your forking euphoria, your ultimate downfall has now been sealed.
Big blockers blame small blockers for the fork; small blockers blame big blockers. I think a split was inevitable given the two distinct visions for Bitcoin's future.
Regarding destabilizing mining, I think what this means is that in the medium term, only one chain will survive (at least with any real value). The miners will eventually see their incentive to kill off one of the chains.
The question is which one.