Yeah the lack of data is a problem. ED or third party devs have their own expectations of a good FM and they are properly not ok with a semi good FM.
But there a some Replicas. 1 to. 1 rebuilds with real blueprints.
Maybe thats something we will see in DCS in 5 or 10 years, when there no other Planes left to develope.
For the Jetfighter section the most important Planes are already avaiable. I cant think of much more. After the EF2000 and Mig 23 and some US cold War jets, the Jet section is complete. We want see The F-22, F-35 or modern Russian Modules in DCS anytime soon.
Still hope for some early WWII Planes and Jets. P-36, P-40, IL-2, MiG-3, Yak-15, P-80, Me-262 and some US and Japanise Naval Planes.