Three car F1 teams have been mooted for decades. Well, they did exist in the 50s through to the late 70s. It never gets anywhere because enough people oppose it, and now it'll never happen with the current budget caps.
It could be a part solution to salary caps, the big teams can afford way more than the current budget cap. If there were allowed double the cap to run 4 cars they could easily afford it - except they will complain about prize money split - but then they are being silly because F1 is a way to spend rich company money not make money.
It also wouldn't work as the grid size and pit garages are limited to pretty much what we have now, give or take an extra team or so.
You'd either have all the circuits having to enlarge their pit facilities (never going to happen - either impossible due to available room to do so or just prohibitively expensive) or teams take a hit on the space they have to work in.
Nah, I reckon many Grade1 circuits can host WEC or other events with bigger fields... I think the logistics of expanding pit garages would be possible.
Also some of the extra cars would come from lower teams that would become amalgamated into the top team. ie. Alpha Tauri marketing can be run on RedBull cars 3 and 4 and they save cost on the design of those cars.
They didn't have a third dedicated crew for the T-Car though, as would be required with a full-time third car/driver. Whoever needed the third car had their crew work on it. With a full-time third driver you'd need three times the staff, equipment, three times the data processing etc etc.
It's not three times... its 1.5x for a 2 car team becoming 3, and 2x for a 2 car team becoming a 4 car team... but the salary cap also increases for the team by 1.5x or 2x and they get economy of saving cost on design by just making more of the same parts...
In fact in the case of AlphaTauri becoming RedBull3 and RedBull4 the data processing could be more efficient as they don't need different systems etc.
From a design point I really like the variation of all the teams, but really the Alfa Tauri and Haas designs are kind of not very good and the drivers would be far better off if they were driving in a 3rd or 4th RedBull or Ferrari.
Aston Martin can be used as the paint for Mercedes 3rd and 4th car so they don't need to copy the homework again...
Except here I contradict myself as I really like the shape of the Aston Martin even if it is mostly slow as heck I support it for the effort and think it's probably cooler thing on the grid than having an extra Merc.
I haven't completely considered customer car scenario but it's possible that could be included in this... also the 3rd and 4th cars could easily be painted differently like Indycar teams, however from a spectator and competition point of view it would be best if it was clear that the drivers were in the same equipment - more driver have a similar opportunity of success.