While I support the full range of CC licenses for open access, CC-BY is the simplest option for the profit-oriented commercial publisher wishing to be taken seriously about its commitment to open access publishing - important because this perception will help a publisher to be on the list of publishers / journals suitable for those funding open access article processing fees.
Next steps I would recommend to Wiley:
- a commitment to publishing journals in a format suitable for data and/or text-mining and that will facilitate re-use of portions of content (for example, a CC-BY license on a locked-down PDF removes legal barriers to re-use, but not technical barriers)
- a strengthened commitment to support for author self-archiving to allow authors more choice (not all authors have funding support for open access article processing fees)
- prepare to compete for high quality publishing services at reasonable prices - consider a range of possible future competitors that includes PeerJ with prices starting at $99 for a lifetime of publishing