I understand some of your concerns, but like some of you have also pointed out, the album is about the message it will send. We all want to see them do well sales-wise, but they could probably care less.
What should be considered more than anything is the fresh impact this album will have. You have two of the game's most influential and respected rappers exploring and delving into a creative realm that hip-hop has never seen before. Without listening to the album, you already know that chopped up soul samples transitioning into dubstep beats sounds insanely awesome.
The vision they have involves rappers pushing the envelope and the title "Watch The Throne" symbolizes the gold standard. They don't want rappers to copy them, they want them to learn from them.
Finally, in the scenario I described above, like with any album leak, it would be on you to decide if you want to listen or not. I think while the lyrics will paint a nice picture, the aforementioned message is general and can be inferred from something as simple as the title.