The Royals will still suck when all their prospects reach the majors, if that ever even happens. If they get one star player and 4 other average major leaguer starters (like top 15 or so for position players), they'll have done well with their 10 prospects. That's still only 5 players. Where are the rest going to come from? We've seen with the Nats how hard it is to get quality free agents to come here.
couldn't the same be said of the nats (or any other team)?