Lior, two points.
1) One can choose to sever relationships with parents or children with no ramifications, other than financial obligations regarding young children, and of course the mitzvah of kibud/mora for which there is no get. Only marriage requires a get, or l’havdil, secular divorce, to terminate it. I do agree with you that marriage has become too disposable to many, but I don’t see the point of comparison to other relationships.
2) At what point does a husband reach the understanding that despite the wife being entirely wrong for wanting to end the marriage, she is not changing her mind? Two years? Five years? Never? If a woman left her husband twenty years ago for silly reasons, should he not give the get simply because she’s still in the wrong?