In a recent article in Outside magazine Alberto Salazar said "the more you run,the more support your foot needs," and "the second most-common cause of injuries, next to running too much on hard surfaces, is foot pronation and shoe instability." Was that just another way of saying that most runners should be wearing stability shoes? Should my next pair of shoes be Nike Zoom Structures or LunarGlides instead of the Pegasus even if I'm not experience any problems just so I can prevent a potential injury?