Well, it’s true these models are being axed (just in the USA for RS 4) but not for the reasons the story suggests. A4, S4 and RS 4 Cabriolets naturally will be replaced by A5/S5/RS 5 versions. Why develop a two-door version of the sedan when you have a more voluptuous coupe roughly the same size and on the same platform? Drop top A5s were expected to replace drop top A4s all along.
RS 4 is a slightly different story. For starters, a B8 RS 4 Avant IS in the cards and in development. Sources at Audi have told us this. RS aficionados may recall that the original RS 2 and B5 RS 4 were Avant only. There was never much of a business case for RS 4 sedans in Europe. When B7 development began, adding a USA model made development of an RS 4 sedan a positive business case. The US will now get the RS 5 and so will Europe, making not enough demand for an RS 4 sedan even for Europe. While the RS 4 Avant is expected, it will likely be a European model only as only 1 in 10 A4s sold in the USA is an Avant.