I think that the whole rule book change is a problem for shooters already participating in the sport. For new shooters it won't be a problem. I say this because the whole problem is the people who have hundreds of dollars invested in equipment, such as myself, that we can no longer use in the sport. The people that shoot wheel guns have a serious issue if they have a gun that was set up for IDPA and shot successfully, or not, with that gun that is now illegal under the new rule book for weight or barrel length. They now have to buy a new gun or not shoot IDPA.
I think that it's the competetive nature of the sport that builds your shooting skills. Your desire to win or do well motivates you to practice and improve. Same goes for any sport. Guys that play football will practice and train for months on end prior to going into a new season to do well. No different with IDPA. The hours that you spend in your living room dryfiring, practicing magazine changes etc. causes you to get better, not just the shooting in the occasional match. Sure the scenarios hone your "defensive" shooting skills, target acquisition and all that, but all that being said, IDPA is still a sport.
The equipment/guns we have bought aren't cheap. It isn't necessarily that they give a shooter the competetive edge over another shooter, it is the fact that everybody that has previously leagal equipment that is now illegal has to go buy new stuff, throw in the towel, or move over to IPSC/USPSA.
For me the issue has turned into a money issue, not having a good time or doing my best. That's still going to happen, regardless. Having to explain to House Hold 6 why I have to go spend another $300 for a new holster setup or $700 plus for a new gun has turned into the issue. Just my $0.02.