What happened to bands in Nashville?

Alabama, Sawyer Brown, Diamond Rio, Richota, Little Texas. All of these were great groups, that put out great music through the 80s, 90s, and early 2000s. What happened to them? What happened to great country groups in general? Have people gotten so star and power hungry, that they aren't willing to share the fame and money with other musicians? I think it is a sad commentary that the country band has gone by the way in the last ten years. Groups have been responsible for some of the best music ever churned out in the hustle and bustle that is Nashville. I call for less selfishness, and more collaboration to produce decent music!