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Probably not. Those who want a traditional marriage can still have one. Most people will opt for tradition, even though something like 50% of straight marriages will end in divorce, but I guess that's just part of the tradition.

The institution of Marriage is in very sorry shape, in large part because people have lost sight of its fundamental purposes:

To join together two families, and start a third.
To allow men to know who their offspring are (men in particular, since if a woman gives birth to a child, it's a pretty safe bet the child is 'hers').
To ensure that each child has one person (alive or dead) to call "father" and one to call "mother", as well as two extended families ("father's side" and "mother's side") in which to be a part.

For the institution of marriage to recover, I believe people must be more aware of why it exists in the first place. While it is not necessary that every couple who gets married have children, people should nonetheless bear in mind that marriage is about families (including extended families), not just couples.

To use an analogy, the purpose of a library is to provide books for people to read. That does not mean that everyone who enters a library is required to check out and read a book. If a couple friends want to use a library as a rendez-vous point, that's apt to be fine even if they have no intention of checking out any books provided that they conduct themselves discretely and do not interfere with others who are using the library for its main purpose. If, however, a group of people were to descend upon the library who made no secret that their being there had nothing to do with checking out books, and if they drew attention to themselves and their actions, the librarians might very rightly be upset and should have every right to kick them out. If the librarians failed to do so, the book-filled buildig would lose its utility as a library.