With the current grid as it is, no. The Vettel-RBR partnership, the Alonso-Massa combo at Ferrari and, possibly this year but probably after the engine regs, Ham at Mercedes all seem to be too good for a Lotus to beat. Raikonnen can get third or possibly even second in the championship, but the current grid looks too good for another WDC.
On the other hand, I can definitely see another WDC if the grid changes. If RBR produce a dog of a car, Massa leaves and his new teammate troubles Alonso like 07, or Webber leaves and Red bull want the Iceman in, then he could do it.