As someone who wrote a western pilot -- it's not an easy thing because westerns scare people. It's seen as a risk. Even when I had an Emmy nominated director attached people still seemed hesitant.
They're not impossible because they still get made but it is likely one of those, right place, right time, kind of things. All the stars need to align to get it done.
Having said that, my western pilot has been an amazing sample. People aren't scare to read them -- just scared to throw money at them