I think that the only real problem is that the FIM is pushing this too hard. The manufacturers, especially the smaller ones, must be resisting the move to four strokes. I think that the move will hurt the smaller manufacturers badly because of the costs for research and design needed to get a four stroke to be competitive with the current two strokes. There will need to be a lot of work done to get a competitve bike that is light enough, and reliable enough to compete in the World Trials Champs. Sure the companies such as Montesa with their Honda motor and Scorpa with the Yamaha, and even Beta possibly with Suzuki motors will have the advantage over Gas Gas and Sherco, and may well be able to work out a deal for a trials four stroke motor developed straight from Japan. But there still will be major development costs and it will hit us in the end with much more expensive bikes. A TYZ Yamaha new in '93 cost NZ$18,000, (which meant that there are hardly any about over here) if you compare that to say a '94 Gas Gas of the same time at less than $7,000, the Yamaha doesn't look like such a good deal!! This could be what the whole four stroke debacle does for us!!
People everywhere are already bashing Gas Gas for having problems with their Pro model, and as the bike is a technical leap forward it is difficult for them to get the bike right first time out as they don't have millions to spend on development. The cost of developing something better has to be balanced against how much profit the company will make - which won't be that much because of the small market for these bikes (especially if everyone thinks that a particular model is a lemon and unreliable). We only have to look at the bikes from Cannondale and the speed it is taking them to get their bike to an acceptable level of reliability and performance. Montesa is still using the same design from '97, and it is the development costs that mean they don't make huge motor or frame changes to improve on their original design.
Because the trials manufacturers are very small operations, and there probably isn't that much profit in producing the bikes, this may well put some of them out of business, or make them concentrate on more profitable models, such as enduro or scooters. I personally like the ability to choose between more than two or three brands of trials bike, and I am disapointed that the move to four strokes seems to be purely a political gesture driven by the FIM to appease the greens in europe, and which won't really improve the quality of the atmosphere in europe anyway.
You can remove the soap box now!! Sorry for the rant....