Yes, you are into something. However I think you can forget about getting the 2017 version of google to implement it.

You might have better luck with trying to implement it as an extension to Firefox although the extension API is (at least for now) going to be a shadow of its former self AFAIK.

My tab tree is the closest thing I've come to an effort-less mind-map that works for me. (Effortless as in ctrl-click to open a new sub-tree so I can always see what is related to what and how I found something really hard-to-find-but useful.)

Even though my current setup works well I'm quite sure I or someone else will be able to create something event better in the future.