It is now clear that ITS will disappear some day. Do you see SAP rewriting its mySAP.com transactions (e-Procurement, CRM, etc.) in BSP technology (in the WAS) or in iViews, or both?
ITS will fade away very gradually. When a specific component will be changed to use new technologies will depend on the individual app component. For details, you need to talk to the SAP product managers of the individual components.