Here's one important thing to also consider, adding custom morph injections is not a violation of the EULA, as you require the original mesh to do use it.  You are not distributing a mesh or a figure, you are saying "take vertex #x and move it here"  Without a frame of reference or any knowledge where vertex #x is, you can't even use it.

From the way I understand how the WM will be distributed it will be similar.  It will refer to a specific vertex or group of them, say how those interact with the others around them and go from there.  If you took all the data from the "WM INJ" file and tried to reverse engineer it into a figure, you would get...well, nothing.  I can tell you how point A interacts with a million points, but until you know something about where they all are in relation to each other (something the INJ file would not have) it is worthless.

Besides, DAZ has already spoken and said that doing a script/INJ form of distributing WM's is perfectly legal. (Reference: http://www.runtimedna.com/forum/showthread.php?65006-Distibution-of-weight-mapping-legal-issues.-Confirmation-from-DAZ )

In the end, DAZ has already spoke and has said that they are done with Poser when it comes to figures, so expect new figures from other sources to take her place anyways.