What would have Episode V and VI have become like if George Lucas used the unrevised fourth draft for Star Wars?

And how much influence would it have had on the PT?

How different would these movies have been in this case? Would Lucas ever had created Yoda, if Obi Wan didn’t die and would the Jedi have become the bureocratic order we have seen in the prequels?

Would Star Wars ever have become as succesful as it has and would the second and the third movie actually have any kind of resemblance to ESB and ROTJ?

How much impact on the progressing story would this decission have had?

http://www.starwarz.com/starkiller/star-wars-the-adventures-of-luke-starkiller-as-taken-from-the-journal-of-the-whills/

I find it interesting that The Emperor doesn’t abolish The Senate in the unrevised fourth draft. This would change the political situation after Return of the Jedi.