To add to the 'don't have to need something to want something', ilvl you accumulate now will make life easier comes next expansion, as much as people like to diss it. It means you'll have an easier time fighting mobs on the overworld, in dungeons (in part carrying those who are less geared), in solo instances, you won't even need to worry about gear replacements until roughly halfway in to the x.0 patch... In other words, people who invest more time pre-expansion gearing up will get to spend more time just playing the expansion until quite a ways in. It's worth it.