New poll had been posted on the ISPA site
The working assumption is that reliance on SQL Server database mirroring/log shipping leaves some big gaps in terms of availability (due to failover time, potential loss of data with async mirroring, inability to allow online db maintenance etc.) and scalability (no scale-out for site collections that grow big and live in a single SQL instance).
Are these real pain points for SharePoint users?
Cast your vote here http://www.sharepointpros.org/Pages/Default.aspx