In Blender 2.7 all sculpting brushes had shortcuts assigned to them through either fixed keys, like "S" for Smooth or "G" for Grab, or by using the number keys to select the first 10 brushes in the list of brushes and Shift + "Any Number Key" to select the 10 listed after that.
Since the number keys are now set to switching modes it makes sense to finally assign fixed shortcuts to the rest of the sculpting brushes. The new way of sorting brushes into drop-downs to easily cycle though multiple brushes with the same key makes this easier as well.
Currently the "X" and "I" shortcuts for SculptDraw and Inflate & Blob are not working anymore while Nudge & Rotate and Fill/Deepen don't have any shortcuts assigned to them.
The shortcuts Shift + T and P became free due to the new sorting and D, W & V has not been used before.
I would suggest to sort Flatten/Contrast & Scrape/Peaks into their own drop-down and leave "S" exclusively for Smooth since it's the most switched to brush and should be always accessible as fast as possible.
Those two could be sorted together with Fill/Deepen on the Shift + T shortcut since that one was used for Flatten before and all 3 brushes are used to make a surface increasingly flat.
SculptDraw could be changed from "X" to "D" since it's for drawing and "X" can be used for Nudge & Rotate instead. There's not a good reason for it to be "X" though. It can be just as well any other free key on the left side of the keyboard but none of the letters make any contextual sense for these 2 brushes anyway.
This way all brushes have fixed shortcuts and if new brushes are created by duplicating existing ones, they will also react to those existing shortcuts and can be just cycled through.