To follow up earlier post ... right on target, so many DSLR's out in an audience, and all clicking away, at least one or two are bound to "get lucky" and hit a 'reasonably decent shot', and offer it for peanuts or free.
No no no no no, that is absolutely not what this is about. It is about making some of the best general sports photographers in the world freelancers rather than staffers. It means no more gear budget, no more medical benefit costs, no more post processing staff and equipment and the office space and cost they incur, no more travel expenses etc etc, it is about cost cutting not about buying the one shot a fan might have, those fans will never get the access and they will never get the releases, heck most high end sports venues have 8" lens limitations.
The same photographers will be shooting the same venues with the same gear, SI will not have any of the costs associated with getting a photographer, or photographic team, to a venue and they will have the ability to buy any freelancers images if they want to.
What will happen is the ex staff photographers won't make as much effort to try new stuff, they will have to concentrate on bankable sale-able images first and foremost because they now have gear budgets, travel costs, and health insurance, to pay out of whatever they can sell on the market.