This change provides an added benefit of cleaning up the Twitter app ecosystem. Twitter is changing, and if an app developer won't make this change they probably wouldn't ever be inspired to update their app to use new features^, and users would go elsewhere (in this case sooner rather than later).

^ Single-use apps--visualizations come to mind--deserve a pass. They do one neat thing and don't necessarily need to grow and evolve outside their niche. I'm sure one app or another will be missed.