For one, that's not even on the Blizzard forums. That's someone speculating on this forum, and they weren't even convinced that it was a good idea. They listed some pros:
And acknowledged the cons:
Once again, this was a post by a raider who was complaining about spending too much time finding pugs:
You have yet to provide me with a single example of a non-raider who was asking for random raids. Both examples you gave me came from raiders who were frustrated by the difficulty of finding PUGs and/or by old raiding content being recycled as heroic dungeons. This is what you claim to be proving:
I think there is plenty of evidence for the second part of that sentence. Blizzard has stated time and again that that was their intent and that they met that goal. You have yet to show me a desire among casual players to make raiding more accessible. You've shown me a desire among raiders who are annoyed at the ever-growing difficulty of finding raiding pugs. That's been my point all along. LFR was made for the benefit of raiders, not for the benefit of non-raiders.