Why do people keep thinking apple's strategy is dictated by what everyone else does? Apple does what they think is best, and others adapt to them - not the other way around.
Just look at the much clamored for "headless imac" - half of MR thinks apple is stupid for leaving this "hole in their product line up" and letting other computer makers take all that potential business. Maybe that's right and maybe it's not (IMO, $29b in the bank says apple execs knows more about engineering/marketing/sales than the average MR poster, but what do I know), but the fact that dell offers headless towers hasn't, and won't, force apple to do the same. Likewise, this product will not push apple in to doing anything they weren't going to do anyway.
That aside, this will flop. Dell should stick to what they're good at - selling fairly high-quality generic computers at good prices. That's a profitable strategy, and they execute it fairly well. But let's not pretend they know how to innovate.