How many miles can you put on a Toyota? …What is the life expectancy of the engine? The transmission? The chassis?
This all depends on how well they are maintained. Yes, brand is a factor, but it isn’t that big of a factor.
Personally, I would get these items fixed, but it really depends on your needs. How reliable do you need your vehicle to be? Can you afford a new vehicle? The answers to these questions might help you decide.