My main skepticism on the touch bar is the fact that Apple is not making it a standard component across the board (ahem).

When a user-interface device is non-standard, it tends to not be supported very well, because companies/developers don't have time to spend designing and testing the interaction, much less the actual code, for the relatively few users who have the device.

Apple may have more success with this, because MacOS developers will be more likely to have it and may want to play with their new toy...