I predict that Elon's cross country road trip will be delayed. Tesla is WAY behind in the supercharger rollout vs. what was promised in late May, and it will take more than a tweet from the CEO to make it happen faster.
If you go to
this page and click on the slider you can see the current rollout status and the plans for Fall (which ends on Dec. 20th) and Winter (which ends on Mar. 20th). The only way he could take a cross country trip by the end of this year would be if Tesla prioritized the I-70/I-80 superchargers from Winter ahead of all the other superchargers they have promised.