Time will tell, but I wonder if reliability will be the issue. USB-C has 24 contacts crammed in there. That's a lot of tiny parts for something that gets manhandled and lint packed as much as a phone charger connection.
If I was on the hook to warranty replace $600 devices when the internal connector gets ruined I might take my time jumping on board too.
It isn't like Lightning is super reliable. I have had many official cables fall apart within a year of normal business travel and at least one port on an iPhone 6 fail most likely due to something getting in the port (although Apple never stated that obviously).
I doubt USB-C is that much worse than Lightning. Even if it is say 10% less reliable as a cable it would still be much better to have a USB-C port simply because you are more likely to have a USB-C cable if everything else uses it.
You may have just saved me a trip to the Apple Store, thanks. I hadn't realized there was a build up of lint, and cables were failing to "clip" into my phone.
Sadly nothing fixed it and I tried a dozen things.
Totally anecdotal but I have had a Nexus 6P for over a year now and no issues with the USB-C port so, for me, it is just as durable so far as Lightning :)
If I was on the hook to warranty replace $600 devices when the internal connector gets ruined I might take my time jumping on board too.