I'm sorry, but you really think they're going to refund you the full cost of a unit that they haven't sold for... what, 7 years now? Plus missed work costs?
This isn't like with the XBox 360, where there was an actual defect in the product design, so Microsoft extended everyone's warranties and ate $1bn+ to do it. This is a product that they only sold a few of, a serious amount of time ago. The product worked (more or less) as designed. They're all far out of warranty, and the last update was in '09 to help deal with the end of NTSC programming. This isn't like with Moxi, where they were (supposedly) selling lifetime guide service as part of the deal - they sold a device, which uses a service not provided by them. They may have had a limited-period contract with Gemstar, who was later bought by Macrovision (who became Rovi), but that contract is almost certainly long expired.
If someone can convince Rovi it's in their interest to keep TVGoS going, good on them. That said, (1) I consider that highly improbable at this point, because it sounds like they're bleeding red ink in part due to it, and (2) the anger over a 7+ year old device being non-functional in the near future is uncalled-for. Sony doesn't "owe" it to you for them to go to bat for you for a device they haven't sold in years, and won't be making more of *ever*, to try to arm-twist Rovi into doing something they clearly don't want to do. There's no possible grounds for a lawsuit here, and you're kidding yourself to think otherwise.
In short, STOP. Take a few breaths. Think about what you're saying here. Really, really think about it.