I think Ed Wood was quite a special case. Lucasfilms probably couldn't find a director like him if they tried.
However, I think there's a point at which it really doesn't matter who directs. Star Wars has become large enough to smother itself. Face it - they could have resurrected Errol Flynn in his prime for the PT, and it still wouldn't have been "swashbuckling" enough for some fans; they could have shown caps of the series bible in the PT films, and it still wouldn't have explained continuity enough for some fans; etc., etc. Remember, the OT falls very short in many aspects of science fiction, because it was a melodrama - a "space opera" a la
old pulp serial stories. As such, the Original Trilogy succeeded because it was original (even when it wasn't, but that's a different topic.) The OT's unprecedented success was a factor in ensuring that those fans would be less than thrilled with whatever came out as the PT, and that effect would be further magnified for any new trilogy because of pressure to exceed that.
"We've been over this. We don't shoot first and ask questions later."
"Of course! We never ask questions."