To be fair, Odds are that in 2021 if the BTC price prediction of Stock to Flow are almost fulfilled I will pull the trigger and get one.
Announced autonomy will be crazy amazing! In the past 4 years only once I have done a trip that would have needed to stop and recharge the batteries before arrival. But also, with 400 miles (670km) of autonomy, you need a coffee stop / toilet break at least once or twice before the battery is empty ( driving at aprox 75km/h between cities).
I'm curious, why only now that there is a "truck" you are interested? None of the previous models work for you? Do you really need to be traveling long distances in a truck rather than a sedan?
By 2021 these cars will be even cheaper. You can already buy an used model S for almost the same price of a new model 3. There is also the other car manufacturers bringing their electric cars which will bring options and competition in the market.
Oh and someone actually modded a regular model S into a truck, it doesn't look like the cybertruck at all, its just a half model s with a flat back, and its actually working fine. Of course it doesn't fit 4 people but the usual 2, and i think its smaller and compact, which is very useful in certain places (probably not so much in America).