My local association has gone to black pants for foul weather only. However, there is a "broad interpretation" of what foul weather is. Personally, I like the pants a lot. I'd vote the knickers out as soon as I can, if I had a vote. I'd also just as quickly vote in 2" stripes on the shirts.
However, any permanent uniform changes need a 2- or 3-year advance notice so that people can get sufficient use out of clothing that would become obsolete.