Wait for a few years until everyone upgraded and no longer uses any deprecated functions. Then view HN threads of people saying they have thirty-million-line c

Wait for a few years until everyone upgraded and no longer uses any deprecated functions. Then view HN threads of people saying they have thirty-million-line codebases which utterly rely on deprecated functionality and they never ever plan to upgrade or do even basic maintenance ever for any reason ever, and will abandon your platform and completely rewrite in something that treats them "better".