I don’t generally buy into the conspiracy theories about touch screen voting, the group most involved in the issue in Maryland, TrueVote Maryland, is overrun by Greens determined to get nothing done, so that they can blame the Democrats.
I think that the machines are insecure, unreliable, and they don’t provide an adequite voting record, but the reason it’s good news that the Ohio county containing Cleveland is moving to optical scan is because I’ve used the touch screen machine, and they suck wet farts from dead pigeons.
They are buggy, the break down a lot, and they make for much longer lines, discouraging voting.
As to access for the blind, there are simple inexpensive solutions (basically a terminal with earphones and an integrated printer).