Well WWE doesn't care about creating new stars, so....
They care about it but it fails (more or less).
Sheamus, Jack Swagger, Miz, Del Rio and also the recent Ziggler or Ryback pushes are pretty good, but so far never totally worked, even if WWE tries very hard.
Probably the only big star coming out of WWE of recent time is CM Punk. And even he is not (yet) on a level of a Rock, Lesnar, Austin, Kurt Angle, Kevin Nash, Undertaker, HBK etc.
I think they just try to hard to create stars instead of giving some wrestlers more freedom and let them connect to the audience.
For me it makes sense that they bring back Rock, Lesnar or Austin, as these are really THE stars that still connect xtremely well with the audience.