I think there is a chance that memory card maker will make smaller physical size memory card to replace MicroSD cards for external storage on phones and tablets. Memory card and phone makers can save money by using a smaller size storage chip, less plastic, metal, and other materials to build a smaller size memory card, and memory card readers and slots on phones and tablets. Memory card makers will also save money on shipping and handling if the cards weigh less, and take up less space in shipping boxes.
I think in the future, external memory cards for smartphones and tablets maybe very basic where the card is a storage chip with a few data connectors on it like some thin laptop SSDs where it is a smaller stamp-size or business card size card with a SSD storage chip, and a small connector at the end which is used for data transfer and power.
Smaller size external memory cards in the future may need a tool, and small tray to install them and take them out of a phone and tablet like current cell phone nano-SIM cards.
I think in the future, external memory cards for smartphones and tablets maybe very basic where the card is a storage chip with a few data connectors on it like some thin laptop SSDs where it is a smaller stamp-size or business card size card with a SSD storage chip, and a small connector at the end which is used for data transfer and power.
Smaller size external memory cards in the future may need a tool, and small tray to install them and take them out of a phone and tablet like current cell phone nano-SIM cards.