I would like Falcon 5 to be the F-35, somehow... I mean, we had Falcon in the 80s, not long after the Viper was introduced, so why not?
This, absolutely this! As such, +1
The F-35 is the logical successor for the F-16 in a "Falcon sim". The F-35 (-A in this case) is the replacement of the F-16 and just like the F-16 will be USAF's (and many allied forces) workhouse/main fighter aircraft.
Besides, the F-35 due to it's sensor fusions, advanced electronics and advanced capabilities (such as stealth) will be a very easy plane to learn how to fly and fight with which IMO is good to attracting new players to the genre.
On top of this, addons/DLC's can be easily made where for instance and after the F-35A being released, addons/DLC's with the F-35B and F-35C could be made and released later on.