Hello,
There's multiple answers to that question:
First of all, I'm no big fan of DRM myself. I'll admit that I had to download a crack for certain games I bought because I couldn't get the DRM to work.
That said, the DRM is something most publishers insist on and a bonus for a developer is that online activation systems do allow more transparency in terms of what the actual sales are. It helps in the discussion that always arise in terms of how many units were actually sold, which is important to developers because that amount determines how we earn our living.
To answer your question, In the past we always removed the DRM from our games after a certain amount of time and this will be no different here.
In the unlikely event that we aren't around anymore by the time that happens, then the publisher will most likely be around.
In the unlikely event that the publisher isn't around anymore, the activation servers which are hosted by Sony should still be around.
In the unlikely event that Sony isn't around anymore, then there's always the opportunity to get a crack (though the current ones are unstable at best so they'll have to work a bit harder
)
In the unlikely event that there's no cracks around anymore, well, then I think you might have problem, but I think the chances of a retail shop closing are a lot higher.
Hope that helps
