Perhaps more of a glut, then. Nice “problem” to have — careful what you wish for. Where I live, we more or less have just a handful of mediocre local marathon races to choose from in the calendar year. In this case, increased competition might be beneficial. The older races will have to ensure the quality of their offerings to continue to appeal to their 'base.' The newer races will have to step it up and offer what other, established races cannot or will not. Some will simply continue to work well as niche races, serving a particular community and essentially unaffected by draws that are more remote, more expensive, more crowded.