The long term ascending line shown on my OP graphic, now passing on about 2100 is still a very strong possibility. There is however a second ascending line passing now at about 2430 that might also be a long term support.
I find trend lines to be unreliable S/R; I really only look at horizontal levels and moving averages. A short-lived dump into the $2,000s is very possible, and probably even likely. But I don't think there are any real price supports there, so it's anyone's guess where the exact bottom might be. I'm just operating under the assumption that just like 2015, any dumps below the 200-week MA will get bought back up.