My knowledge is based on information available .
Creating a constitutional convention in the United States requires a high threshold of support. The process for amending the U.S. Constitution is outlined in Article V, and it requires either a two-thirds majority vote in both houses of Congress or a convention called by two-thirds of state legislatures. Any proposed amendment from such a convention would need to be ratified by three-fourths of the states.
The likelihood of a constitutional convention specifically aimed at eliminating same-sex marriage is difficult to predict. there had been no successful efforts to call for a convention for this purpose. Additionally, social attitudes and political climates can change over time, making future outcomes uncertain.
Regarding the second part of your question, if same-sex marriages were ever voided through a constitutional amendment or any other legal means, it would have significant legal and social implications. Advising same-sex couples on what to do in such a scenario would depend on the specific legal changes and the response from various authorities and organizations.
In such a situation, it is essential for same-sex couples to seek legal advice from experienced attorneys who specialize in family law and LGBTQ+ rights. They can provide guidance on the best course of action based on the specific circumstances and laws in their jurisdiction. Additionally, LGBTQ+ advocacy groups and support networks can offer resources and assistance to navigate potential challenges resulting from changes in marriage laws.