Yea I fully agree. In my experience the truck market is the one that is the most attached to their ICE's. I could be wrong, but Tesla will probably have a lot of trouble taking a solid portion of that market.
There will surely people who will hold on to ICE but if you can buy a produce that has electric drive train and competes on all metric its is incredibly unlikely that it would not find a market.
Specially if it has features that ICE don't have, like the ability to attach power tools.