Interferometers are powerful survey machines with fine spatial resolution that can open new possibilities in fast radio transients surveys. We have demonstrated this concept by using the VLA to image the sky with a cadence of 5 ms. This observing mode produces 1 TB hour\(^{-1}\) in images that we can search with a parallelized transient detection pipeline. We are currently using this system to search for a newly-discovered population of cosmological radio transients. Science at these extreme data rates is limited by internet speeds and data management. We argue that real-time transient detection at the telescope can alleviate these challenges and open new modes of observing.