long as you do so long

Steel shafts are less expensive than graphite, so the same set of clubs will cost less with steel shafts than with graphite shafts.
Graphite shafts transmit fewer vibrations up the shaft to the golfer's hands than do steel shafts. You might want that added feedback that steel shafts offer - or you might be tired of your hands stinging so much on mis-hit shots.This might be good or bad, depending on your skill level and your desire.
Steel shafts were once considered much more durable than graphite. Quality graphite shafts will last as long as you do so long as they are not chipped, cracked, or the laminate-seal is not peeling. That's not so much the case anymore. Steel shafts will last forever so long as they are not bent, rusted or pitted.