As for Jedi and the force. Here is my take. Most people who lived through the clone wars probably still blame the Jedi to some degree for the conflict. They might not buy the New Order line that the Jedi threatened to take over the government, but the Clone Wars were costly in both material and in a personal sense for many people. I would think if someone came across a person using the force they'd be concerned. If the person was old enough to have been in the Wars they probably would happily report them to the authorities. If the person was younger than that, they'd probably at least be concerned and shun them. I don't think anyone had forgotten the force, it was just better to ignore it, to pretend it didn't exist or that it was "evil". Let's look at terms used for Jedi or the force in A New Hope. Owen calls Obi Wan a "wizard" and General Motti mentions Vader's "sorcerer's ways". People remember they've just vilified the force and simplified anyone who uses it to be dealing with powers that are best left alone.
That's my take at least.
I can get behind this, the fact is that GL made a huge, dumb flub with the timeline. The Clone Wars needed to be recent enough in memory for Luke's dad and Obi-Wan to have been in them and for people to be aware of them, but old enough that the disappearance of the Jedi after them would seem like a long time ago. (Just like the failure to justify how Obi-Wan aged so much in 20 years, going from looking like a 30-something to a 70-something. But I guess being in th desert can do that to you, it's just always stuck out as incongruous to me).
I mean part of the mishandling is that the Clone Wars only lasted like 3 years, and the Jedi were pretty well-regarded before that. Imperial censorship and the "conspiracy proposition" that the Jedi were trying to overthrow the government aside, it's hard to believe people didn't remember them. It's been 100 years but we remember World War I participants better than Star Wars remembers the Jedi after < 20 years.
Yeah it was handled poorly, no doubt. Maybe I just put blinders on to it, but I just find a middle ground. While the Jedi had a good reputation for the most part prior to the Clone Wars, I also don't think many people had first hand experience with them. The galaxy is big, and from what I can tell few Jedi spent a lot of time in the outrim worlds, so it is possible that those areas never had the same conception of the Jedi as they did in the heart of the Republic.
Either way, though, I can't see the Jedi as "forgotten" in this period. I just take it as its a topic best not discussed. I have heard from Germans who grew up in Germany shortly after the Second World War that there was little talk about the Nazi period. Culturally it was just better not discussed. While not at all the same as the Clone Wars and the Jedi purge, I can see the same cultural "hushing" of the topic potentially happening.