Long Tail, or just one company handling everything?
The "Long Tail" was never a hymn to diversity, and it was never that long either. It needs a monopoly distribution channel, serving an enormous market. It's no "bazaar", and it's not a "cathedral" either - think of a giant Wal-Mart.
There's no evidence to suggest that internet commerce or app stores or music download services have a longer tail than their real-world equivalents - Once you normalise the figures.
That last bit is important. If the "tail" contains only 1% of all sales, but is 80% of the catalogue (numbers off the top of my head; the real situation is far worse), then it is only viable to have a product in this tail if the total number of sales is so colossal that your tiny share of that 1% is significant. In this aspect, Anderson was right, but he didn't explore the reasons why this works, because nobody likes to be seen to support monopolies.
Amazon have a dominant place in bookselling, and generate just such a colossal number of sales as a result. Similarly, the Apple and Android app stores can produce this number of sales, as does iTunes. But these are monopoly or near-monopoly providers of their goods. Perhaps the only reason there's a viable tail at all is because, in a non-monopoly provider, these more esoteric parts of the catalogue would be carried by specialist retailers, and so would not appear in the tail of the monopoly distributor.
But this "specialist lists" is still happening, although indirectly and informally. Magazines, blogs and user groups (like online forums) maintain their own informal "collections" of apps, complete with direct links in to the store. This, like buying from the Top 10, is another form of aggregation, but it's not one that's visible from the storefront. (I haven't worked with iOS in years, but I think putting such a referral service into an app may even be a violation of Apple's Terms of Service).
Lets just hope that Apple/Amazon/Google don't start behaving like other retail monopolies. App developers would then have to pay "hello money" just to be listed, as is common practice with large supermarkets.