I'd say it's very unlikely. In super cheap eMMC the controller usually has the largest chance of dying early, but a proper 8GB eMMC modules really isn't that ex

I'd say it's very unlikely. In super cheap eMMC the controller usually has the largest chance of dying early, but a proper 8GB eMMC modules really isn't that expensive, so I don't think they saved money there. If the controller doesn't die, then the next reliability issue for your eMMC module is probably NAND wear. The ReMarkable has an 8GB eMMC module. Such a module can probably manage at least 1TB TBW (Total Bytes Written), and you won't reach that too quickly: the OS will eat a significant chunk of that 1TB, but apart from that all you do on this device is reading, writing and drawing. Those tasks do not require many program/erase cycles on the NAND at all, so I'd say it would take many years before you've worn out the NAND blocks.