Map bigger than 4GB

Hi. The DACH map is now bigger than 4GB. It is not possible to use this map on (older) Garmin devices as e.g. my Oregon or GPSMAP as only FAT32 file system is supported. No issue so far as I can download D, A and CH as separately. But what will happen if the Germany map grows over 4GB one day? It is currently at ~3.4 GB....