We did it during the last FA. It can be strategic depending on your badge production. Remember that not all badges are created equal.
I don't recall the exact details for our switch, but basically the first half of Blue was easy, but the second half required a bunch of 48 hour tier 1 badges. Whereas the second half of green was easy. If we switched to green halfway, it cost us more badges (because we completed 2 waypoints), but the badges were easy to farm (breweries and bakers, I think).
The GamersGem has a really nice image that shows you exactly what badges are required where on the paths. Gives much more granular info than just "Green costs 50 breweries" for example.