You know, I think that we actually would see more Star Wars films. Many more, perhaps even than we got in OTL.
Here's why: if the original Star Wars is still a success but not a "blockbuster" success, then they can continue making sequels as a reliable money-earner -- but each film wouldn't be the "event" it is in OTL. This means that George Lucas becomes less attached to the series (as it's less of a success, he doesn't feel the same need to "nurture" it) and he sticks with his original plan of retreating to the role of executive producer of the series for all the sequels, letting other people handle all the writing and direction. This means that he won't eventually burn himself out on Star Wars in the early-to-mid-80s and give up on making any more films after his divorce, like he did in OTL.
So the series can actually continue through the 80s, if it keeps making profits. And actually, if they're lower-budget movies I guess they could also be made more quickly: once every two years, perhaps, rather than once every three. In fact, we might even see the realisation of George Lucas's original concept of twelve Star Wars films, like the old 1930s serials had twelve episodes. But, again, they'd have to keep on being reasonably successful.
