Well, ROTJ's <I>working</I> title was Blue Harvest, but we won't get into that!
I'm not sure I agree with that article's reasoning behind why we see less of these posters, nor some of the comments made by the artists.
Drawn art for movie posters go right back to the beginning of film, not just to around the 1970s. I have a number of "movie poster" books that illustrate publicity for early comedy movies, most notably the Marx Bros output for Paramount in the 1930s.
And 1940s/50s posters were practically ALL drawn. In the 1960s, things got a bit more real as the stars wanted to see their own faces on the posters, and by the 70s there were some pretty bad artists doing the drawing. It began to pick up in the late 70s and we got some pretty good artwork again through the 1980s.
I see what they're saying, that art reduced doesn't look great on video boxes, but I disagree. I think the most major recent movie to use a poster like that was the first Harry Potter, but when it came to disc they swapped it for a lame-o photo montage, with just as many small details. And how come the poster art was used on the even smaller CD soundtrack cover? They never had a problem with that.
Also, Drew Struzan's most recent projects have been home video commissions from Warner Bros for new cover art to adorn their reissues of The Shawshank Redemption and The Green Mile. Why commission art JUST for the video covers if this is the so-called reason it's dying out?
I think the real reason is that more and more films are based on opening weekends and bringing folks in based on seeing the stars in the movie. After all, decent stories and plots went out the window long ago. So posters are relying more on the "real faces" of the stars to be more instabtly recognisable. While they don't sell the overall film as well, they do promote who's in it, and especially when it comes to video usually these posters are discarded as well to basically make way for the "floating head syndrome" where a front cover is usually a huge head-shot of the lead(s) and nothing more.
Old posters used to either tell you more about THE MOVIE or get you excited and intrigued to see it. Nowadays, everything is splashed everywhere and it's only all about who's in it and how much it makes in the first three days.
Some posters still work, but it's becoming more of a graphic-art thing, such as the inspired concept for The Devil Wears Prada. The old, drawn posters are much missed though.
For more gorgeous art, check out Drew's own site. There USED to be a treasure trove of amazing material and a lot of pre-titled poster art, but a lot of that has been taken down. There's still a wealth of art on show here though:
http://www.drewstruzan.com/