Haha, this is great! The authors simulate the future trajectory of the interplanetary Tesla roadster and conclude “we estimate the probability of a collision with Earth and Venus over the next one million years to be 6% and 2.5%, respectively. We estimate the dynamical lifetime of the Tesla to be a few tens of millions of years.”
A complication is that the space-car will make a close pass by Earth in 2091, which makes its orbital path hard to extrapolate accurately past that point.
h/t Christopher De Vries