RE: Embraer, Avro, Bombardier and Dornier-Boring future?

I don’t think this problem lies just with regional jets, but virtually all airliners.

For example, the B757 and TU-204 look similar as do the Tristar and DC-10. The 777 just looks like a fatter 767 to me. This problem, if you want to call it that, is not just exclusive to aircraft, but other modes of transport such as saloon cars and trains.

My main point is that all of the above have been designed in a conventional manner, a tried and tested method of design. It would cost a manufacturer a lot more money if they went down the road of designing something radical. Concorde anyone?