I will share some of my thoughts about what could happen in the future of blender here.
Its just a theory, I might or not be Right!
After 2.8 release, the community will be split between the Right and the Left clickers. It will be a fuzzy moment.
Just a few months after, all the tutorials will only teach the left keymap or don’t teach shortcuts at all since it’s the default
after a year, all the Right clickers will feel forced to try to switch to Left.
At this time, an explosion of add-ons promising to bring back the 2.7 workflow will appear
.
This will be a dark time for the community that will be cut in half with the experienced people unable to help the newbies for a while.
After a year and 6 months, all users will have learned the left keymap but not get used with,
The vintage add-ons will be left behind.
Ever since Blender will lose its reputation of being a faster modeling workflow than any other software.
Modelers will become slightly more slow maybe around 30% but the models quality will improve a bit as a side effect.
There will be some old-school modelers that will be faster by creating their own workflow and might appear some realtime speedmodeling videos on YouTube.
After 2.5 years, Eevee will be the only feature that can be compared superior to other software, not because its superior, instead because the shader designers will get smarter and develop hacky node setups to solve realism challenges with eevee.
Then all proprietary software will have its own built-in realtime renderer. Eevee maybe can still be superior though, it depends on the development effort.
An uncertain amout of years later, developers will find that right keymap is not used anymore and will remove it just like happened with BGE and Blender Render.
BUT.
The community, already missing the speed for a while may decide to create its own collaborative keymap from scratch(maybe as an super customizable addon) this addon-keymap may be completely messy and intended for who wanna be fast at modeling, It won’t include selection overrides but will work arround that by making other parts of the workflow fast like with smart menus and smart custom manipulators, probably can become as popular as Looptools.
If that happens It can become official and shipped with blender.
The end.