I'm not refitting this thing. Refitting a trendline that gets lowered every 3-4 years while also projecting it forward 10 years is for the birds. It either holds or I walk away.
I'll post updates to these for as long as I find them useful, but there won't be any version 2.0s. No change of variables. No tweaking the training data. I called my shot years ago and I'll let the chips fall where they may.