During it first closest approach to Mars, it was a mere 5 million miles away from the red planet. According to observer.com, it's ultimate fate will be to crash into the Earth or Venus. However, since it is in a Mars crossing orbit, it may eventually encounter Mars. However, obviously, if it has crashed it can not encounter Mars. So, will Roadster ever encounter Mars?
The Roadster will have a close encounter with Earth in 2091 which will alter its orbit, but it is very hard to predict exactly where it will end up as its orbit will be somewhat chaotic due to the gravitational influence of Venus, Earth and Mars. Calculations suggest that the Roadster will remain in orbit for tens of millions of years before hitting a planet.
There is a 6% chance of it hitting Earth and a 2.5% chance of hitting Venus in the next million years. After 3 million years, the odds of an Earth crash rise to 10%. In the longer term, the Roadster has a 50% chance of lasting a few tens of millions of years.