If they're so butt-hurt about it, maybe they should actually make games that are good enough that I want to keep playing them once I'm done, instead of flipping them for something else once I'm done. Of course EA wants to cash in on the second-hand market, but this sucks. I haven't bought a game in five or six years that I didn't trade at least one older game in for, and a lot of my games have been funded entirely by trade-ins.
If EA and Sony manage to change the landscape to a point where I stop being able to get meaningful amounts for my trade-ins, I'm not going to be happy. I can't blame EA for wanting to deepen their pockets, but damn, give us a break.
Second hand games are lower priced because you lose a lot of the benefits associated with buying an unopened game - returns/refunds for defective products, the certainty that you get buying a game new, knowing you're the only owner, promotional materials, any manufacturer's warranties, etc. You don't get any of that when you buy a game used - you get whatever the seller is willing to offer you. Some retailers are kind enough to offer a limited return policy for used games, while others sell used games "as is". Being forced to fork over extra cash to the manufacturer, without getting back any of the protections enjoyed by the first owner (if any - this is inapplicable in some, if not many cases) is a load of crap.
Will I boycott EA/Sony because of this? Highly unlikely. Will I be pissed that the trade-in value of my games is decreasing? Absolutely. Will I buy fewer games in the long run, if my trade-in values decrease? Almost certainly. And the greedy manufacturers will have no one but themselves to blame for it.
But then, I'm just one guy. They'll probably survive.