In thought there is not a huge problem with this type of thing. However, It will not help anything with a majority of players. Normally, instead of people that have disabilities, it's the casuals who are the ones that are asking to be able to complete the same content the hard cores are finishing. So let's say we dumb things down for (people that really shouldn't be playing MMO's or atleast playing "harder" MMO's) people with disablities. Indeed they are now able to complete what the non-disabled player can and thats great, however, soon the "I want the gear they get from completion sets in". The forums get flooded with complaints about it. It's happend in almost every MMO I can think of that has that type of scenario. Because of this, I've seen MMO's dumb down content and make almost everything easy-mode. I really don't want to see that here.