I wonder if they will ever do a 7 8 and 9
Who knows. The problem right now with the SW universe is it's been filled out a lot by games, books and such. So depending on the story you want to tell it could be a PITA to make one that flows with the established lore. But if they want to make another SW movie just connected to the other movies, then it wouldn't be as big of an issue.
Personally I'd like to see the first 3 episodes basically trashed and restarted. The story of Anakin's training could be a good one if it's done right. There's no reason to have a entire build up movie just to meet the little kid version of Anakin at the end. You can establish how Anakin was a slave taken away from his mother in the first 10-20 minutes of the move, and then have the rest of the 1st movie centered around a young Anakin that's showing more promise than any other young Jedi.
You can have him be an outcast... others make fun of him for being a filthy slave they dug out of the dirt. He gets mad and beats the shit out of some kid, maybe even kills him by accident. This is the first taste of showing Anakin may have a dark streak. Normally with this kind of behavior he'd be booted immediately from the Academy, but his power is so great that the Jedi keep him on. In the back of their mind they know there's a secret looming Sith threat that they haven't yet found, and they need an extremely powerful Jedi on their side. So insead Anakin gets special solo traning from none other than Obi Wan, maybe even watched over by Yoda from time to time. Because of this 1 on 1 training Obi Wan and Anakin become great friends.
Meanwhile you have this Senator who works very closely with the Jedi. He respects them and they work together to get the Jedi to be an integral part of the system... they're supposed to be a keeper of the peace. Without some political plug they might not be trusted by the senate. So this senator helps them be understood by the masses, and the Jedi help by curbing any violence or wars that other factions may wage on the various systems. Let's call this senator... I dunno, maybe Palpatine.
Certain assignments are tough, so advanced Jedi are sent on them. Obi Wan and Anakin are the dream team in this regard. They don't get separated... ever... unlike how they did in the prequels. Palpatine hears these stories and becomes quite interested in Anakin. Behind the Jedi Councel's back Palpatine has little one on one talks with Anakin during down times. Asks him his backgound, etc... generally just acting like a grandfather. He's very forgiving, seems trustworthy, and because Anakin has no family he connects with this kind hearted old man quite easily. Eventually he lets slip that during his youth he hurt another Jedi. After some time Palpatine convinces Anakin that this was in self defense, and not true hate or rage. The universe wanted to punish this kid for being a bully, and he got what was coming to him. This is the beginning of when Palpatine blurs the line of anger/rage/revenge and Anakins morals and training. If this kid was truly as wicked as he acted, how could I be at fault for stopping him? Is it not what I've been doing all along as a keeper of the peace?
This is also the beginning of where Anakin starts to question the Jedi ways. They start to seem counter-intuitive, and not easy to follow. Why do they consider it wrong to hurt a bully who deserved his punishment, but perfectly fine to take part in battles when needed? Either way you're fighting to prevent others from getting hurt further, so what's the big deal? Eventually this questioning leads to Anakin siding with Palpatine. He's convinced the Jedi way is not the way things should be ran. He helps Palpatine establish an empire and disperse the Jedi. Without his knowing the Empire is taking part in murdering the Jedi by the thousands.
Obi Wan is tasked with stopping this new threat, and unfortunately his good friend is standing in his way. Anakin is protecting Palpatine, who he feels is the only family he has at this point. They fight, Anakin loses, Obi Wan is no match for Emperor who up until this moment didn't know he knew he was a Sith Lord. Obi Wan barely escapes with his life. Palpatine "fixes" Anakin who needs artificial limbs and robotic life support to survive.
*sorry that was so long... but once I started writing it all clicked. This was all written over my morning coffee so it's not complete and may not make 100% sense, but it's NOT hard to write this character in a better way