Let's face it. Colossus has hit a wall. Reader interest in the character is at an all-time low. His suicide was ignominious and his rebirth a disappointment to everyone who wanted to see a Jean-Emma catfight.
The character is a prop; a non-entity. His brother Mikhail became a more relevant force in the MU than Piotr, and his sister, dead for 20(?) years, remained far more compelling to fans. He's the opposite of Women in Refrigerators as he exists to make his sister and his girlfriend seem deeper and Storm more sensitive. When he killed himself, the pay-off was an entire issue of Kitty ranting at Xavier about how she is sick of Shi'ar frozen dinners.
Several attempts have been made to rehabilitate him, including him turning him into a gay drug addict in the Ultimate Universe which was ruined when they saddled him with Northstar as a boyfriend (as if Peter couldn't do worlds better than that guy). David Hine tried to show that he was "insane" by heredity.
Even on Nation X the guy is floundering. In a recent issue about farming, it was little Snowflake who headlined not Piotr. I mean, a FARMING story and Colossus didn't appear (though he did appear in the previous story where he taught the New Mutants how to use a tractor, but after that it appears that Sam and Ilyanna took over farming duties)! WTH? They can't even kill him off because no one cared the last time he died. It's an in-joke in the books themselves that this character is stuck in his glory days.