You could remove Java from most people's PCs and the only side effect would be more disk space.
This is pretty much my experience with Java. If I am Joe Q Ignorant User, and every now and then Java is updated, and every time it's updated it displays an ad for OpenOffice.org, I am going to conflate it with those cheesy pop-ups my tech-head son says I shouldn't click on.
To the end user, Java means nothing. And why should it mean anything?
Well, almost nothing. If anything gets in between me and my Minecraft, worlds will end. And I mean that as hard as I can.