The majority of Rovers fans will of been taken to their first game by a family member, who was probably taken to their first game by another family member.
To look at this you need to put yourselves in the position of someone who has never been to a match at Ewood or potentially any other sporting event anywhere.
Going to your first game, without being taken, isn't as straight forward a process as it could be, granted the Internet probably makes it easier than it was 20-30 years it's easy to find ticket info online and buy tickets. But where would you sit, where would you feel safest with your kids, how much swearing will there be, will the traffic be bad, where will I park, will there be problems with away fans as I go back to my car.
All things that once you've been to a couple of games probably don't seem like an issue, but if you never been they are all reasons why you might take the kids to the cinema instead.
A simple to use well publicised park and ride that you can pre-book and guarantee a simple and straight forward match day experience has got to help, the first time fan, but it's not going to instantly add thousands on to the average gate. I'd probably go as far as to say it probably wouldn't get that much use on a matchday as there is so much on street parking, so would no doubt be cancelled as a failure.