I'd agree completely!
I'm a real fan of the D2 and, IMHO, if you've got a good one then it's well worth keeping. I had my gearbox 'serviced' last year (it had been done once before) and plan to do that regularly. The ZF specialist advised annually, saying that you'd not leave the oiland filter in an engine for 60K miles or more, so why the gearbox?
But I know, if the gearbox did fail, then I'd simply get it sorted. The rest of the car is far too good to scrap. I know the sums would make an accountant have a fit, but I doubt any of us bought the car as an investment (ha ha!) and most of us love them (the cars, not the accountants!

).
But even so, the financial argument of what it will cost to swallow the loss and buy another car (carrying similar risks of unforseen problems) are valid.
So, if you love the car, keep it. In all probability, the gearbox is the worst thing that'll go wrong.
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2002 Final Edition S8. Ebony black with Silver Grey leather and myrtle wood trim.
Current mods: solar sun roof, 20mm rear spacers, 15 mm on front, red brembo callipers, 6k headlights, rear view camera, engine remap, alloy dash dial rings, alloy navi rings, tt/phaeton pedal upgrade, (and custom matching foot rest) dension ipod interface & parrot hands free kit (both fully hidden), av input, tv in motion switched thro' PF switch in blanking plug right of steering column, Audi 'quattro' sill covers, repositioned centre console switches, radio clock, .
Planned mods: auto-dimming rear view mirror, dash cam (as steamship's), fit the ski hatch, refit philips drl's (or maybe not - nope, definitely not - horrible botch!).