Comment # 8 on bug 1206774 from Jiri Slaby

The TODO says:
+The saa7146-based drivers are one of the few drivers still not using
+the vb2 framework, so these drivers are now deprecated with the intent of
+removing them altogether by the beginning of 2023.
+
+In order to keep these drivers they have to be converted to vb2.
+If someone is interested in doing this work, then contact the
+linux-media mailinglist (https://linuxtv.org/lists.php).

So if there are no volunteers, the driver is going away.