Alternatives To W3C's Vision

The W3C's vision is for universal access based on open standards.

Sound great, but:

• Is this practical? (I'm using PowerPoint!)
• Should we rule out pragmatic solutions (our users will use Microsoft software, Flash & PDF formats) – if proprietary formats can be accessible is this a problem?
• Should WAI (indirectly) impose its views rather than leaving organisations to chose appropriate strategies?