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One thing about smaller - at a certain point things would collapse because there won't be enough collectors and dealers to support the catalog producers, the album producers, the expertizers etc
Not sure I agree on that, albums not produced by the big album producers are already proliferating on the web (see the success of the Steiner pages). We are beginning to see online stamp catalogs which, while they may not have valuations that the majority of collectors would accept today as valid, are at least creating the database that would allow for the marketplace to develop online catalogs that would, over time, come to be seen as a valid reflection of values.
As for expertisers, that is very much an individual skill, and while many are less than fond of PSE because of the whole slabbing phenomenon, the fact that they have created a fairly successful expertising service that is accepted by many in the philatelic marketplace shows that new expertisers do not necessarily have to be part of established organizations to gain legitimacy in the marketplace.
the current marketplace infrastructure might go through a major transformation over the next couple decades as the hobby continues to evolve, but the basic needs of the marketplace will be met via new ventures and projects - they already are in fact beginning to be met in the case of albums.