Interestingly, most of those ideas were far earlier than ST:TNG was. Roddenberry had written a lot of them down based on 1960s science fiction during the time

Interestingly, most of those ideas were far earlier than ST:TNG was. Roddenberry had written a lot of them down based on 1960s science fiction during the time he was working on the original series. He wanted to do the holodeck already back then, but there was no way to do it reasonably convincingly given the technology of the time.