Labels and folding cartons are the low hanging fruit and offer the easiest transition points for a commercial shop. If a Commercial Printer already has a digital press it's not a big leap to doing either. He has to learn about new substrates and probably different finishing processes (diecutting, for example), but all doable. A guy with a digital press is already familiar with short runs and probably has an operation that's geared for those. And at least some digital presses have the flexibility to do some packaging without a huge additional investment.