Musk has said that it's his 'favorite next product': https://electrek.co/guides/tesla-pickup-truck/
I'm sure at some point he'll deliver a pickup truck, and it will probably be quite popular. But until he actually starts delivering it, it's kind of pointless to plan around.
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.
Like landing first stages, apparently. Crazy guy.