Flying in 2D on your monitor still has its advantages. I love seeing the outside view of the plane and with effects like contrails and other things coming to the sim in the coming months flying with the outside view will become even better. Its also the best way to see the environment and marvel at how great the graphics and weather effects can look.
VR is amazing (when it works) and I agree that its the ultimate way to experience the sense of immersion the sim can give. For me though headset hardware still isn’t there yet. When headsets can give the same really clear image I can get on my 4K monitor and a wider angle of view then I would be ready to ditch playing the sim in 2D. Give it 4 or 5 years I reckon.