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There are more options than Samsung when it comes to purchasing phones. Why would they not move over to another OEM if they HAD to have an sdcard? It's not happening and it's not going to start happening. With 128GB options out there sdcards are moot.
Again, you keep ignoring that an SD card is not the only factor in a phone purchase. That several factors of equal or greater importance dictate a purchase in no way means people don't care about an SD card. But people CLEARLY care about more storage otherwise Apple would only sell it's 16gig IPhones (and wouldn't be discontinuing it).
Your logic about cloud storage is also terribly flawed. Unless you got in early, you have to piecemeal together free storage for it to amount to anything significant, which is why an SD card is a superior option. Google offers plenty of free storage for music, but most people think the player stinks. It's also an issue with limited data plans. And it's an issue in areas with no wifi or data (i.e. airplanes).