This has been the case on nearly every open source and proprietary project, I have worked on.
Most people do not care and will stick with the old default on old projects and use the new default on new projects. Occasionally, it stokes conversations around possible third options that are more descriptive like stable or development, but the norm is to just go with the default.
Going out of your way to set the default to the old name really reeks to me of slacktivism. People probably think that they're taking a stand, but in actual fact others will just assume that your repository is older or that you have an old configuration.
Most people do not care and will stick with the old default on old projects and use the new default on new projects. Occasionally, it stokes conversations around possible third options that are more descriptive like stable or development, but the norm is to just go with the default.
Going out of your way to set the default to the old name really reeks to me of slacktivism. People probably think that they're taking a stand, but in actual fact others will just assume that your repository is older or that you have an old configuration.