IMO, things will get worse before they get better. When the oil crisis hit many people switched to imports because the US car companies didn't have much to offer in that part of the market. Many of these people have stayed with them since then, raising families where their kids first car was probably an import. Some people might have come back for trucks/suvs but the Japanese have been getting into that market recently too.
I think the unions do play a part in it, although they are not solely to blame. They do add up to a higher labor cost, which when you are making run-of-the-mill cars, does not work out so well. IMO, the UAW, the 3 "domestic" (if you want to count DCX) companies and maybe even the gov't need to sit down and come to a realization that if the unions do not relax their demands the high costs will keep making things worse and worse where eventually people won't have jobs....
