you first point (the only one I was courageous enough to read) is a good one... RROD hit a portion of the communoty, PSN hits 100% and hits devs too (sales).
Moreover, the argument that one can just play the 360 tills it comes back up is the same that someone can just play the PS3 while RROD is repaired, so it's neutral.
I do believe that a service outage of this magnitude will be more harmfull in the long run than the RROD was. I mean RROD is an accepted fact, you send in the console and get one back in a matter of 2 weeks. Here you lost the service, were not informed, were told it'd be back, it's not back, you learn your credit card info is with the Hackers.... overall this is starting to be a pretty big hindrance for everyone. Now sure some people are not affected as they play single player and all, but let's face it, the active game buying community is the one on PSN, the one that has friend lists, the one that enjoys an online game to releave the stress.
Financially, this could have a larger cost for sony, as their gaming brand was worth a lot more than Microsoft's at the time of both "scandals", and future repercutions will potentially be worse... MS took a net cost hit by extanding warranty significantly, Sony... is offering a free month of service... so not a cost, but also not something that has the same significance to the customer.