It is realistic if they will build it commercially. Probably almost anything can work technically but if they do not give significant benefits, they fail commercially and be never used.
I think piloting is not a problem nowadays. It will have computer assisted fly by wire system in any case. Computers can fly unstable planes which are impossible for human pilots. If it can be developed and produced at reasonable costs, save significant amount of energy (or be otherwise environmentally friendly)and be safe to travel it will probably come in production. It may take couple of decades because aviation officials are so extremely conservative but at the end money talks. But I will say it realistic after all this have realized.
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