This change will have one interesting effect - it will force out white-box manufacturers (mostly from China), that used to flood the market with devices earlier on. A third of white box device makers are likely to exit the market in the first half of 2013 as margins get thinner and the tablet market matures.
With prices on white box devices in the range of $59 to $199, there is already plenty of competition between smaller manufacturers, but when the big companies enter those prices it will just become unbearable for some.
Expectations are that Apple will be the only company that will be capable of retaining its high-margin while others push the market down. Which after all is great for the consumer.