How long until everyone you know (include non technical people) upgrade to them? I personally don't carry flash drives around, but I occasionally need to get files from non technical friends who do, and many of them are still using old 128mb or less USB 1.1 flash drives.

Why would they go out and buy new ones to fit in certain models of laptop if the limited capacity and slow speed hasn't already gotten them to replace it?

Sure, but what will be the adoption rate? Do people have to have both or drives with both ports? For how long will you be more likely to see standard USB flash drives than USB-C ones? What will the cost of USB-C flash drives be compared to standard USB ones?

All important questions to answer before you walk out the door without a dongle.