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The road map of PI System including PI SDK can be accessed from this link.
You may also refer to this post on Deprecating the PI SDK
To quote from the above blog
"We are not cancelling the PI SDK and will not do so for some time to come.... Microsoft has been moving away from COM technology towards the .NET Framework for some time. Our AF SDK is built with the .NET Framework and now has the vast majority of the features of the PI SDK including direct access to points in the PI Data Archive. We think the AF SDK is ready to take over!"
PI SDK is old technology but it will continue to be supported it in future too.
Actually PI API which is older than PI SDK is also still supported.
A lot of interfaces use PI API to write values. So PI Data Archive need to support it.
PI SDK is used by not only client tools but also interfaces to read pi points attributes information.
So PI Data Archive needs to support these old protocols.
If the number of the interfaces that OSIsoft has released is only 5 or 10, then it is easy to replace these old technologies to AF SDK.
But there are so many interfaces/products that is using PI API, PI SDK.
So it is difficult to stop supporting.