I know there was a promo-piece with the Thing and Colossus squaring off, but not sure if that is a definite fight. If it is, and Thing also beats Colossus with Jugg's powers (which will happen if they do fight), then that's a wrap for Juggolossus, and makes normal powered Colossus the biggest wimp of all the Marvel bricks. Colossus haters will rejoice, and besides being a real cool character, my favorite of all fiction, I will have to concede that any character in the MU could defeat Colossus.
What they should do next is make him a herald of Galactus, who loses to Deadpool or Jessica Jones, by sacrificing himself to help people. Of course, in the beginning of the fight, he is full on power cosmic, to show how tough he is. But he holds back, since if he went full out, then he might hurt someone (and this from a guy who snapped Riptides neck since he could not bear the screams of his teammates and the Morlocks being shredded behind him, and is "made of rage"). Then have a cameo of Kitty telling him he is an idiot and why they can't be together anymore.
That should be followed up by him becoming the embodiment of Eternity, and lose to the Protector or Maria Hill. They outsmart him, and shoot him in the eye, and he lets himself lose since he knows if he actually fights back, he might hurt someone. Mind you, in the beginning have him winning, to show how much tougher Protector and Maria Hill are than Peter.
Then he gets the Infinity Gauntlet, and Pixie and Rockslide take him down. Kitty shows up and tells him he is an idiot.
So then, he joins Brian Woods team of X-Men, and gets beat by every new bad guy within the first 4 panels of the fight, and the new bad guy later on gets taken out by Domino or Pixie.
It's a great time to be a Colossus fan, folks! This ranks up with when they killed him off for a few years!