There just aren't any standalone HDD/DVD recorders being made anymore for the US market, except for the Magnavox, which tries to keep it's costs to a bare minimum, to appeal to the "Wal-Mart mentality" crowd. TVGOS would add too much to the cost.
HDD/DVD recorders apparently just weren't profitable enough in the US for the manufacturers to keep selling them here, and those are where you'd see the digital TVGOS, if they were still around.
standalone DVR currently being made with the digital TVGOS is the OTA-only DTVPal (there are some current flat-panel LCD's that have it built-in, though - mainly Sony's and Mitsubishi's. But it generally only goes a day or two out with info in those, for some reason - whereas in the DTVPal, it should go out at least 7 or 8 days, like the analog one does).
So TVGOS is not dead at all, really - at least at the current time (neither analog nor digital - just the OTA analog version - some cable companies still carry it in analog, though). Still, I wouldn't exactly call it "thriving".
For cable, the TiVo can be bought with a pre-paid, lifetime fee (I got mine that way for $550.00), and the Moxi ($500.00) already includes the fee in it's price. Information on those and the others can be found here (to start): http://www.avsforum.com/avs-vb/showthread.php?t=1204433
On a side note, after your cable company "transitions", they still may be sending the analog TVGOS out over a local analog channel. In that case, you may be able to split your signal, so that you can still continue to receive it with your Panny's analog tuner. You'd have to have something better than just their basic, free "DTA", though - because the EH75V's IR blaster won't control that. It would be more likely to control (change the channels on) one of their better tuners, though. Also, the the DTA's don't have built-in timers of any sort to change channels on their own, like their better tuners often do (so you wouldn't even need to use the IR blaster in that case - and even if you're not receiving the analog TVGOS, you will still be able to set timers manually on both the recorder and the tuner).