By the time anyone on your PS is good enough for a MEANINGFUL roster spot he'll be poached by another team. PS winds up being Scrub Squab. It's good that it's here, but I see it as a first step towards something that actually has an impact -- right now it's a feature without any impact.
The PS would be meaningful if lower-level rookies in the 60's could have Quick or Superstar Dev Traits, and those traits could only be known to a team that that player had spent time with. THEN PS would be meaningful. As it is now, there will NEVER be a Kurt Warner or Undrafted FA type to make an impact in Madden.
Good idea, blah execution, needs refinement next year. Glad it's here though.