Surviving WordPress and plugin updates

3) Relax. You will have to update WP core anyway, so some work is inevitable. If a plugin is discontinued there usually will be an alternative. The most important thing is not to use plugins that require shortcodes in individual posts, because if these are discontinued that will really break your site.

Apart from plugins you will also have to worry about your theme, which may use functions that will be deprecated in future version of WP core.