With so much warmth in the Arctic and cooler than average temps over a large part of the mid-latitudes, my ultimate concern might be 'will we see the eventual breakdown of the jet-stream'? I'd have to guess this is still years if not decades away, but having a much lower temp diff between the two should ultimately allow for warmth just to travel as it wants north.
... we could be witnessing what a breakdown of the jet ultimately will look like?!!
This is not a movie preview. What you reference as something that may happen in the future is happening right now. There is no "upcoming event", it is a continuum. You can answer your own questions by taking what you wrote and changing the future tense into the present tense.
Perhaps the real question should be: How low will the temperature differential get, how fast and how soon?". The ongoing progressive loss of arctic sea ice is in the process of telling us that.
I don't know enough to say for sure, but it seems to me that sustained high temperature anomalies in multiple areas of the arctic are much more than just a warm spell. The jet stream has broken down, but the remaining latent heat of fusion is allowing it to stumble on. This was predicted by people much more knowledgeable that I.
I think a lot of us are falling prey to IPCC-itis. That body has decided that everything is referenced to 2100, when all of us will be dead. ACC has been posited as something in the future for over a hundred years. I still have difficulty adjusting my own time frame, and it seems to be a moving target.
Keep in mind that the IPCC projects that the first BOE will occur in 2040 and then every 10 years after that.
ACC is now, and what we are seeing is the result of emissions that were released up to ~ 10 years ago, so buckle up.
Cheers!