There are a number of questions of course. Did they have a problem with sales of the ST? Were costs too high? Given the rules did the rear tank hinder the bike? As others have said I do not think that Power would be a problem as most riders seemed to think it had too much in ST300 form anyway. Rather oddly we came across riders saying the bike was hard to ride who were winning their class. As it stands if they had gone to EFI this year My son would have been buying one. In this old fashioned form it's not really in the running.
Most of the development of the Trials Bike seems to have been in the Frame and looking at this one, besides the Obvious Scorpa link it also reminds me of the Ossa TR. Personally I think the engines are currently the weak link. They are very susceptible to atmospheric changes and vulnerable to water and dirt ingress where the "Advanced" Sherco and the Ossa had advantages due to higher placement of the Air intake.