[council] Conclusions of gTLDs committee 6 Feb 2003
I believe that we are free to explore versions of structure (though do not recommend we do so in abstracto) and that the CEO and the Board lean toward, as you identify "a taxonomic rationalization".
A taxonomic rationalisation is an objective and a a pre-determined list is but one strategy to get there. On the call there was support for (your proposal?) to not have a pre-determined list due to the problems this would cause. An alternative strategy is to allow sponsors/registries to propose a series of differentiated gTLDs. If each new gTLD were differentiated to its predecessors, a market-driven taxonomy would develop over time. If the committee like that idea, it is then the task to define the criteria for differentiation.