I'd be willing to bet a reasonable amount that there's a large future for "subtractive software development" (maybe a slightly misleading or unfair term, since

I'd be willing to bet a reasonable amount that there's a large future for "subtractive software development" (maybe a slightly misleading or unfair term, since it'd include bugfixes). Once we have multiple proven technologies that handle each of the functional areas that we collectively need, then we'll start to find greater benefit in maintenance, bugfixes, and performance improvements for those existing technologies and their dependencies than we find writing additional code and libraries.