I can see valid arguments from both sides.
I suppose that for the top guys, a lot of classes are 'inferior' or just insignificant and their riders people you just bump into waiting to tech checks, on the starting line, etc... Competitors that take YOUR track time, reduce YOUR number of runs and don't deliver the kind of speed you enjoy.
Plus it's a nightmare to administer, etc... and I can see that with the proliferation of engine type (diesel, electric...), it will go on increasing.
Much has been said about the 1900 or so classes ALREADY existing, although Kent Riches correctly pointed out that some of them only exist on paper; nobody actually shows up in some classes.
From a non-participant point of view, but a keen enthusiast, what attracts me in land racing is DIVERSITY, the fact that anyone can turn up with a bike in any sort of configuration, find a class and be allowed to race.
Compared to other forms of motorcycling, land racing is NOT DULL.
Merging classes or outlawing some of them may turn people away. Equally racer like to measure their performances against bikes similar to their. Not everybody wants to race a Modified turbo Hayabusa, in spite of the fact that they are dominant.
I think that it should stay as it is.