mainly British if a subject or an argument is going to run and run, people will continue to be interested in it for a long time.
We've had over 500 letters on the subject of human cloning. It looks like this one will run and run.
run and run
To continue to be a source of interest or fascination. Primarily heard in UK. I could tell as soon as we published the first in the series that it would run and run—people just can't get enough of it.