that is why they are sold at a cheaper price(Moore's Law). plus if you'll observe, many flash disks now come in even bigger storage capacities that is because in the near future, CDs/DVDs will be obsolete and will be replaced by flash memory. that is why the technology, nowadays, is leaning towards flash memory. there are now notebooks that has no CD/DVD drive(mac). i think that they'll also replace the magnetic disks. we'll never know.