The weight of recent science seems to be in favor of low or lower carb. At least now the overwhelming evidence is that low carb is not dangerous. In spite of this the ADA and other powers that be, as bsc has noted, continue on with their high carb mantra.
Not everyone can stay on low carb. True
Some people can meet their goals on a higher carb regime. True although goals do differ.
My own 2 cents:
I tried the ADA diet and could not meet my goals.
I tried low GI, an improvement but my sugar was still too high.
Low carb (30 to 50 carbs/day) worked best for me. I have been on it for 1.5 years and anticipate no problem staying on it.
This site and the web in general is a great source for recipe ideas to keep things interesting.
Because diabetes is such a complicated condition a one size fits all approach is not appropriate. The best advice I got was from the bloodsugar101 website "Eat to Your Meter". In this way you arrive at a custom diet adapted to your own physiology. But these studies prove you need not fear going low carb.