Closing speeds too high, gunnery here too bad.
Jet on Jet combat especially with guns is split second snapshots, with maneuvering barely within visual range. You don't saddle up at 400.
Collisions would abound, as folks can't compensate. There goes your pretty little Sabre perks, from some noob diving in a -17 at just about the speed of sound.
99.9% of you would get frustrated beyond compare. Again, it's been done before, and it was horrible. You'd have a whole arena, with two competitive airframes. Yay. <Snore>
Whatever, if it makes people happy, go for it. But, as I've said before, over-diversifying one's product has been the bane of many a company. Many of the people saying they're not interested in either WW1 or Korea have already seen it once. But, it seems, history is doomed to repeat itself over and over again.
This mysticism with jets by folks that can't fly a spitfire in the MA's is surreal.
<shrug>