Everyone who paid $400 to $500 dollars above the usual price for a CE item with TVGOS can claim an implied service for the lifetime of the unit--not just DHG owners. That the unit in question is still usable in other respects only shows that the unit is still in its lifetime. Gemstar/Rovi got that money and owes the continued service.
The absence of a manual time/date menu item on the DHG shows that Sony expected the TVGOS service to continue for the lifetime of that unit. The Sony update from analog to digital reception of TVGOS showed that Sony supported TVGOS service for the lifetime of the unit.
Instead of writing a letter to Sony, Toshiba, or whomever, that gets filed in the trash, try your state's consumer complaint site at the state attorney general's website. At the very least they will forward your complaint, but it will arrive in a more noticeable envelope.
If someone bought a first class ticket on a 747 to Europe, and during a stop over were moved to a DC10, should they say "It was good while it lasted," and say they understood the financial hardships of an airline in the real world of business?
What Rovi did seems unfair to many people posting. We don't have to be so nice about it. So the inserters can't be, won't be, restored no matter what. Is it my bad to see if writing to state law officials might, if only, get even a little bit?