To answer your question: I don't know. There are merits and flaws to both the D6 and D20 systems; the likes of which are certainly better answered by others than myself. I simply love the material and could not really care what dress its wearing, as long as it comes to the dance with me.
But, if you like the SW universe to game in but don't grok the rules, you could always try finding a system (ie. GURPS, Fudge, Savage Worlds, Adventure!, etc.) that clicks with your people and just go from there. I daresay there exists, in some form or another, either conversion rules or created ones that use your system of choice.
I think the lack of interest in SW as a roleplaying vehicle somewhat mirrors the (seeming) funk in science-fiction RPGs in general, or perhaps the publics' dislike for liscensed properties as RPGs.