The Customers I talk to have plans to upgrade to Domino 8 in the new year. My gut feel tells me that the adoption rate for v7.x was high, and for v8.x will be higher. For instance, my hosting company prominic just mailed their customers and said:
Prominic.NET is pleased to announce that all Development / Shared servers
will be upgraded to Domino version 8 by the end of November. Beginning
December 1st, messaging customers on these servers may request that we
upgrade their mail template to the latest version 8 mail template. This
template is required if you wish to take advantage of the new features
available in the Notes 8 client.
When are you uprading your servers ?