Certainly many of the bizarro services such as SMS, MMS and expensive international rates will soon be eliminated by IP-based smart phones and their apps.
But the need to finance, provide and run the extremely expensive wireless infrastructure remains. Smartphones are already maxing out UMTS networks and all the new apps surely will assure this in the next ten years. Soon some facebook-style thing will introduce video messaging/posting or some kind of virtual-reality kinky business, which generates a lot of data volume.
So to conclude, the prospects of the wireless operators look better than ever. They just have to come to terms with losing "profit centers" such as SMS and replace that by the Huuuuuge data traffic of the future.