Given the state of the train service this past year, I don't think you could describe todays usage as a fair representation of the usage a functioning train service could attract.
On the contrary - Colne station usage has been fairly stable for the last 5 or so years the average is circa 95,000 https://en.wikipedia.org/wiki/Colne_railway_station
Divide that by 360 (to allow for a few days when there are no trains) and you're looking at 264 people a day - assume an hourly service for 14 hours (which would cover 7 am - 9 pm) and you'd have an average of 18 people per train. Given the demand won't be equal across the whole day, instead focused at certain key times, the scenario posted above is entirely conceivable.