Forget for a minute that Sylar is horribly miscast and the actor playing Peter is just plain horrible. The real problem with these characters is that they're way too powerful. Sure the writers might come up with ever more contrived ways for them to lose control of their powers or become otherwise disabled.
At some point, however, the show will become implausible, uninteresting, or both. Every season will boil down to yet another showdown between the two most powerful characters. The way I see it, there's only one way out of this narrative trap: Sylar and Peter must both die.
I've made no secret of my displeasure with the frankly sloppy writing that's marred the start of this season. The rock paintings that never fade after years in the sun was ridiculous. And the suggestion that Sylar and Peter are brothers strikes me as too much like a soap opera or fairy tale.
But the latter storyline may have a possible saving grace. I'd like to think Angela is plotting to change the future by ridding the world of evil mutantkind using Sylar. Once he's killed them and accumulated their powers, she will sacrifice Peter to rid the world of Sylar.
It's admittedly dark, but if Heroes has balls, that's where they'll go...