Why should someone carry a mincha-maariv with them when they have a blackberry/iphone/etc that they can daven from?
With the little mincha/maariv’s you have to worry about bringing them into bathrooms etc. Phones are a lot easier. And it’s the same davening they are reading from the phone then from the printed siddur so what’s the problem? (They should turn off the network though so that they don’t get calls while trying to daven)