I read the original article posted on this (and keep in mind, Disney itself has not announced the exact rules yet) and my interpretation was not that the ADA accessible rides would not have DAS but that people who have mobility only issues will be expected to use the regular line if it is ADA compliant for wheelchairs.
The article also when on to say in some circumstance people with mobility only issues will not qualify for DAS. An example given was DCA. Apparently all the queues there are wheel chair compliant and the belief is that guest with purely mobility issues would not qualify for a DAS at that park. There is not mention of DAS not being available for guests having different types of issues that prevent them from waiting in certain types of lines.