Could blockchain be used to replace/side step aging mainframes written in COBOL? I'm not expert in the legacy systems or in blockchain but my understanding is t

Could blockchain be used to replace/side step aging mainframes written in COBOL? I'm not expert in the legacy systems or in blockchain but my understanding is that the reason transactions in traditional systems take so long to complete is that the COBOL mainframes are still set up to do batch processing. I wonder if using a (regulated) blockchain to record and process transactions could work to replace or enhance the legacy systems to process transactions in more realtime.