While it may or may not happen, that future in "Five years lost" just might be inevitable.

Whys that? Well, let's take a look here:

-Sylar now has Candice's illusion powers.

-Even though Nathan's dead, there's still another character with a flying ability. The same applies for the healing factor (Claire's supposed to be alive in the future, and Sylar apparently survived some sort of death. Considering that Adam Monroe might appear again in the series, it's always possible that Sylar would kill him and take his power.)

-There's no way that Niki would just die in that explosion. She's lived through worse.

-All the main characters (except for Nathan) are still alive.

-Even though D.L. is dead, who ever said only HE could walk though walls? Sylar could easily find someone else with the same ability and kill them.


And finally, the last and most convincing reason:

Hiro Nakamura went into the past to help Takezo Kensei (Adam Monroe), which accidentally caused the latter to want to kill off humankind. The Company was around BEFORE he went back, so it was basically an inevitable part of the space-time continuum.


Regardless, this is only a theory. But hey, it may happen!