Widening I-25 probably won't do any good (didn't do much good last time we did that), but we keep talking about light rail all the way as far north as Fort Collins, and nothing ever happens other than RTD making money earmarked for new light rail disappear into the aether.
Since I moved here in the mid 1990’s we now have added light rail to Golden, down to Lincoln on I-25, all the way up I225, and I70 from downtown to the airport. Not exactly nothing. Rail to Loveland/Ft Collins would be a great addition.
Sure, maybe a little more trackage around Denver, but don't you remember all the controversy how the space and money to run light rail along 36 went away and we wound up with just a new express lane in its place? Maybe Jared will actually get something done and they'll run light rail in tandem with the BNSF line from Denver all the way north, but I'm still really skeptical because I've heard "it's just 3-4 years out, we have a plan" for at least 15 years now.
The airport lightrail is incredible, but the Golden one is useless unless you're going to court. Great example of politics getting in the way, since the lightrail only serves the government building which is miles away and very uphill from downtown Golden where people live and work.