It's just that things get far more complicated without 'pegging to NXT'. I hope I have highlighted some concerns, and hope that we can collectively come up with solutions.
In terms of vision, my personal belief is that NXT must be a lubricant to many other economic activities. Should aim to be the cheapest and most effortless mechanism in support of everything else. Transaction fees should be kept exceptionally low, and we should never concern ourselves with the value of 1 NXT.
Jack, your analysis of too many trading pairs is mathematically sound insofar as it's THEORETICALLY POSSIBLE that the scenario you describe would happen, but you ignore human behavior and examples of markets that exist in reality.
Let's pretend the USA released its control over the oil markets and oil could now be traded in something other than USD.
Do you really think the markets are going to be flooded with "too many oil markets?" Oil / Wheat, Oil / pork bellies, oil / silver, oil / gold, oil / USD, oil / Euro, oil / copper, oil / cement, oil / ethylene oxide, oil / cocaine, oil / soybeans, oil / yen, oil / iron, oil / corn, oil / orange juice, oil / lumber
Yes...they are all theoretically possible, and in effect, that's what you are so worried about. Hopefully you understand how silly it looks when you see it listed that way.
No, even if oil were not forced to be traded in USD (akin to you insisting that everything be priced in NXT), there would be maybe 3 major oil markets
OIL / USD
OIL / EUR
OIL / CNY
And maybe OIL / JPY (Yen)
These 4 markets would be patronized by whatever was most convenient for the participating traders. A trader in Europe would rather bargain in Euros than dollars.
All the other tiny markets (E.g. oil / orange juice) would be specialized to unique players and would constitute a tiny fraction of the trade that happened. The rest of the world could safely ignore them entirely.
YOU DON'T HAVE TO WORRY that there will be 5000 asset pairs reducing liquidity. Your Nxt client will filter out those asset pairs of small liquidity, and you'd never even see them. If you own an orange tree farm and want to trade orange juice for gold or oil, then you will have to go looking for that info. It would probably be easier, though, for you to sell your oranges for one of the "top tier" currencies, and use that currency to buy your oil.
Let the market work.
Let people do business however THEY see fit.
Do not try to force people to use YOUR favored currency. That is behavior suited for governments.
NXT will succeed, IF we empower people to do business in THEIR preferred way.