I think that's a bit pessimistic. The problem with the Etron was that it was never an £80k car. It was pure greed on Audi's part to price it so high. I had one when I worked there and it was a fine car but it was always a £55k car not £80k!!Thing is they have depreciated like that already, so they won't stop going down yet. You'll probably still lose half on it so may not be such a bargain in the end.
They look good value now. Well built, low maintenance. I'd say better than a Q5 but a lot cheaper now. Almost all cars depreciate. Only downside is that the range is c200 miles on a good day.