I went by pre-booked bus yesterday and knocked nearly an hour from my train or park & ride trip!
Fair enough but that was no doubt at added expense. If you're happy to pay extra to save a few minutes that's fine.
I think that sounds like a good service. However, as already pointed out in this thread, the park and ride sites serve the west and north well but not the east. I imagine at least half an hour extra on top of your calculation after and before the game for those returning east. For evening games that would be a deal breaker for my kids and would also potentially be a problem for Saturday matches due to work commitments.
However desirable it would be for all the supporters to arrive on public transport or park and ride, it won't always suit everyone. I, for one, don't understand the apparent hostility from some quarters regarding this situation.
When you say east, are you coming via the A27 because if so, getting to Mill Road is not going to take that long, maybe a small wait getting to the roundabout at Patcham but in the long run how quickly do people get clear of BF?