Turn off the Cisco's 🙂
(seriously...you can serve both your corporate and public access requirements with just the Ruckus gear. To be fair, probably the Cisco's can do the same but you'd have to check with them on specifics.)
As Srini notes, spectrum is spectrum - if the Cisco's are properly deployed they are using all of it.
And you likely won't need quite as many AP's using our gear, but a site analysis is required to validate that.