Thinking of the 'next car' is really all about being a car enthusiast. Along with reading about it, talking about it, typing about it for the benefit of complete strangers on the super world wide information highway web, etc.
I know somebody who really, really, really wanted a Golf GTi for ten or fifteen years. Overnight his life changed and he could have had as many as he could find for sale, but guess what?...
...He bought a Bentley Azure!!
Only kidding. He decided now he could have one, he really didn't want one that much. He kept his current car, and the next car he bought was a nearly new Astra!! Next car after that a few year old Fiesta. Next car after that a 15 year old Micra. You get the picture.
But that's the thing. For him, it wasn't an interest in cars. It was dreaming of something he never thought he would own. Once he could own one the attraction went away.