It might assist by allowing players more freedom when moving. And I believe if they created a brand new moving system (using the point-click in mind) it'd make players just like the game just a bit more, not running pretty slow and walking weird.
I will say that perhaps they could even make a WASD motion for those players. Although, people not to happy if they did this (acknowledging that a number of you already don't like the improvements/updates that Jagex has made recently). Have you got any suggestions on how they -could- make the motion system simpler and neater/cleaner?
Some more information to find out this idea. Since I only took a few minutes to type the OP. If you want to type any material whatsoever, you click on a box that highlights and is totally prepared to type (regular"Input" for rapid chat). I think that the WASD thought goes really nicely, Jagex just needs some time, also I'd be happy to wait for this if they ever decide to plan this kind of idea. I don't really approve on the arrow key movement, then it would be too close towards the mouse, and could be annoying to me.