I'd say, as with most of these scenarios, it depends on the player's preference, finances and the musical context. If at all possible, it would be great if those thinking of making a move, could have the opportunity to have a decent go on each format to help their decision making. A quick play around in a music shop won't always provide a true experience of what any instrument can (and can't) do. We could just as easily ask if someone should go straight to a seven string and I'd give the same answer. I've owned 4, 5, 6, 7 and 8 string basses all at the same time, and they're as different in function as a professional set of kitchen knives.