It doesn't matter what next generations bring, as long as it has an SD card slot. It is a very thin slot, so most likely it won't go away. Cameras use them.
Actually SD slots may be gone very soon. Remember PCMIA and ExpressCard slots. They were used to connect faster/additional storage and most commonly used for broadband connections. But now we have USB 3.x and TB for data connectivity and we have mobile hotspots from individual devices that offer WiFi or through our phones offering 4G/LTE speeds.
Camera companies are already including WiFi in their devices and maybe even switch to a faster cabled connection. So SD cards will soon be a thing of the past. That's why I stopped investing in SD cards 4 years ago. It's going to be like the floppy disk soon.