Back to the Future came out in 1985. I was born in 1991. Back to the Future is one of my favorite movies and, unless I truly fail as a parent, it will be one of my daughter's favorite movies as well. I was at California Adventure today and there were scores of kids screaming at Lightning McQueen. Kids that were born more than a decade after Cars was released in theaters.
Which is all to say: Yes, agreed. There are plenty of movies that have broad appeal long after their initial wave.