Personally, I think the whole "esc programming" thing is getting blown out of proportion. There comes a point with the timing settings when all you get is less efficiency and more heat. With the Tekin set-up for instance you can turn up the speedo timing and motor timing far enough that the motor won't even run properly. Once the speed control guys find the proper combination for timing it's going to level off some.
Yes, there will be some big changes to the speedo's in the next couple of years. It's still relatively new just like back in the day when brushed speedo's were developing so fast.
The big change now is that the speedo manufacturers are starting to give people the option of updating at home. Saves a ton of money when you can just download an update instead of dropping $200+ for a new speedo.
The first company that maps out the spec motors like an automotive engine (variable timing etc.) will have the first speedo to the finish line.