I can see both good and bad in this,
the good...
The majority of lower division games (only speaking from experience of leagues in South Yorkshire and West Yorkshire) seem to last around 30 -35 overs, by bringing in a shorter format your attracting younger players (15-19) to want to spend a Saturday playing. Many younger players are turned off playing by the potential for games not finishing until 8-9 pm whilst the even younger up and coming players (13-15) see the 50 over format as too long and tiring being stood in the field all day. The hope of getting younger players to turn out on a Saturday in the shorter form means as they grow and develop through to higher levels they move onto 50 overs. We are loosing too many juniors and need to find some way of keeping them involved...they are the future of the game and indeed our clubs!
The bad...
The older, more experienced players have become accustomed to 50 overs and the time it allows at the crease, the shorter form does not suit everyone.
In my opinion I feel that the lower leagues are for teams of mixed ages, the older players passing on the experience and wisdom to your youth. However too many players are clinging onto playing and stopping the younger players coming through. I retired playing at 40, I could have gone on but having played previously at a high level would I really have been happy playing 4th team cricket? That would have stopped the progression of the number of promising juniors coming through the club.
I keep involved with the game both in a coaching and umpiring capacity, the later has seen me take part at a level which on a playing front I'm too old and knackered to take part in. I find these almost as rewarding as playing.
I know the game is for everyone but I think as the older end we have to look to the future and how we can preserve the future of not only our game but also our clubs.
With regards to travel, it never worried me as a player where I was traveling too as long as I was playing and even now having been accepted onto the new Yorkshire League umpiring panel I will be traveling longer distances than ever before.