What are the chances that Florida goes from being a lean Republican state to another Colorado or Pennsylvania in the near future?
I don't know if I understand your question. Do you mean "another Colorado or Virginia", as in Florida becomes a shade of light blue? Because Pennsylvania makes no sense in that category since it is basically a pure swing state.
If that is your question, I don't think anyone can answer when or if Florida becomes a light blue state. There is a huge age gap which would intuitively suggest that over the next decade or two, it would drift that way, but you also have to consider the huge transplant number of retirees from other states who tend to lean Republican (I disagree with the notion that R's will be winning them with 80%+ though, as some here have suggested).
What I mean is when does Florida become comfortably Democratic like Maine or Oregon?