WSN moving to sub-1GHz?

We all know that low power sensor networks operating in the 2.4 GHz ISM band might be subject to severe interference due to transmissions of other devices (mainly WiFi terminals). To address this issue DASH7 is advertising a shift toward lower and potentially less crowded regions of the spectrum. Have a look at this:

http://dash7.org/blog/?p=131

Do you think this is the way to go? I mean, lower frequency bands will also result in lower data rates and require bigger antennas. Furthermore the reduced path-loss might allow for longer communication ranges but also results in higher interference. And what will happen when also the new bands become crowded?

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