For want of better connectivity - a USB port for example - The SD card will still be there for some time. Two reasons come to mind... :
1) As users, we only see one part of the "picture" > the collected data being accessible by end-users - But, you also have maintenance/upgrade imperatives. I don't see the RESMED techs, for example, upgrading a system BIOS/firmware/software over the air. Feasible? Sure. Risky? Very. Slow and risky? Absolutely. So the SD slot will stay... for some time.
2) Not the entire planet is covered by GPRS/2-3-4-5G connectivity. That farmer in a remote Minnesota location can't really depend on signal, nor can therapy be properly administered if no one has access to the data. > SD card iscurrently the only method of delivery
So I would not start stocking up on data-capable systems, just yet...