My point is, there are incompatible aspects in the OT and PT eras. My rant isn't anti-fan, it's just to point out that there are differences in the eras that can't be overlooked or smoothed over without gameplay becoming more and more generic. Let's say I decided to make a card game about American History. Could George Washington command the Union army? Or would he be a Confederate commander?
What are the Prequels about? Senate and bureaucratic machinations and a Jedi police force. The Jedi are strong and The Force is everywhere. Everyone knows who the Jedi are immediately.
What are the Originals about? They are about space combat, and a rebellion vs a totalitarian regime. There are Jedi, but the Jedi have been out of power long enough that no one would believe they exist.
So, how can you reconcile gameplay between two eras with completely different backdrops? How do you play cards trying to accomplish political goals in the senate against an opponent who is trying to sabotage a base? Similarly, you can't have cards for the powerful Jedi in a time when the force is unknown and its existence is doubted. The individual trilogies work by themselves, but not all 6 together. Yes, you could make a game that encompasses all of the eras, but then it wouldn't really feel like the experience of Star Wars. Also, what if the Light Side player has an Anakin themed prequel deck and the other player comes in with a Darth Vader themed OT deck? Who's Anakin is negated? Do the cards that benefit Anakin also benefit Vader if both are allowed to be played?
It's just an endless rabbit hole that wouldn't have to be a concern if the eras are kept distinct and separate. In order for Star Wars to feel like Star Wars, Jedi characters would have to be unplayable in the OT setting. Just as Vader should not be playable before Vader existed. It may be a good game, but it just wouldn't feel like Star Wars in game form. How do you capture the spirit of Star Wars and make the separate eras truly playable together without making them feel like Just Another Game, but featuring art inspired by Star Wars? If they figured it out, they would be starting with Episode I and not Episode IV.
EDIT: I love the Hobbit and The Lord of the Rings, but I don't feel that the characters and situations from The Hobbit should be in situations in The Lord of the Rings and vice versa. There is about a 60 year gap between them.