Looks right. Clinton isn't losing Colorado.
Her ceiling seems to be around 45%. We don't know how undecideds will break, or if Johnson voters switch to Trump on election day.
If you don't know how undecideds will break, then you don't know that her ceiling is around 45%.
Why would someone willing to vote against Trump not have decided against him by now? What the hell could they possibly be waiting for?
So you're saying you do know how undecideds will break, and they'll all break for Trump. That's ridiculous.
To turn your question around, why would someone willing to vote against Clinton not have decided against her by now? Who knows, but as long as there are undecideds, some will end up voting for Clinton, some for Trump, some for third parties.
It's entirely likely many of those undecideds don't vote at all as well, so you can't just automatically assume they're all Trump just because your pessimism is disrupting your ability to use logic.