I live near Glenwood. The canyon is never going to be widened. It was hard enough to build it in the first place. There is not enough capacity through town either, and no good way to fix the problem.
CDOT could always run a four-lane tolled bypass around the canyon for that part of I-70. More room for traffic, and a relief route when rockfalls in the canyon block the road.
When I drove eastbound through the canyon in 2014, there appeared to be a portion of the westbound lanes shut down for work on one of the bridges. There seemed to be a drop/gap of several inches in one of the joints.