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My solution. Interesting to see everyone else's approaches and how they differ!
Oops, missed one! It's been a busy month... :) My solution!
Part time Tableau, Part Time Alteryx. Full Time Awesome
Still working on the advanced piece. I was able to render it out in Tableau, using the Forecasting tool.
My solution, taking advantage of the dynamic tools to choose the columns and rename them.
Thanks @JohnPo for showing me the "Model Coefficients" gallery tool (https://gallery.alteryx.com/#!app/Model-Coefficients/56bcd989a248970ce0ba08be)
My data show a crossover year of 2123.
My first time using the charting tool.
Struggled with the extrapolation piece, but @PhilipMannering solution gave me an excuse to use the R tool for the first time (thanks Philip)
Intersection around the year 2136 or so
Nice to play with the charting tool :)