OP, are you asking about any EV transitioning to a Cybertruck, or Model X owners specifically?
My wife has a 2017 Model X. It's fantastic for people moving and long road trips for her and I, and that's primarily what we've used it for. The Cybertruck won't be any better at those jobs, and it will be much harder to park, so we would not switch for that reason. We have never needed a truck.
However, my wife recently retired and we got a trailer - and she wants to travel with it. We have done some trips with the Model X, but the X's hitch setup isn't really the best for towing, and more range is always better when it is cut in half. And we'll want a good charging network, of course. I can't think of a more suitable vehicle than the Cybertruck for that job, so she has a Cybertruck reserved (and no doubt we'll sell the X if/when it arrives). We are assuming, of course, that the hitch receiver will be sturdier and more accessible, and range will be in the range advertised.
The Cybertruck's delivery date is nebulous, and features and pricing are subject to Musk's whims, so we have backup plans - we also have reservations for a Rivian R1T Max Pack and a Chevy Silverado, both of which say they will offer 400-mile trucks. But even if the Cybertruck's top range is 400 miles rather than the "promised" 500, it will still have the better charging network (yes they are opening up Superchargers to other brands - but only 20% of them by the end of 2024) so the Cybertruck will still be the better towing vehicle overall. Especially for us, given that we already are familiar with driving controls, Superchargers, the app, have Tesla chargers, etc. It might not be as much of a slam dunk for someone not already in the Tesla "network". Or anyone not towing.
Yes, the Cybertruck is unattractive. But I try to not let appearance affect my car purchase decisions, and I'm sure the heck not going to let it affect a truck purchase.