I agree that excessive ants would be bad for bearded dragons for reasons stated already. A couple ants eaten accidently, won't harm a bearded dragon (adult) but babies could become sick quite quickly if they eat alot of ants.
Crickets are not the only food bearded dragons can eat. They can eat silkworms, butterworms, superworms (don't feed to babies under 10-12", supers are better as a treat for adults), various kinds of cockroaches, phoenix worms, horn worms, wax worms (as occasional treats). I am sure more suitable insects will be available as the reptile trade continues to grow. Things to try and avoid is feeding wild caught insects (parasite risk, insecticides and other poisons picked up from food or areas sprayed with insecticides etc), insects known to be toxic to reptiles (fire flies, ants, brightly colored catapillers (ie wild hornworms are toxic because of the food they eat. Farmed ones are raised on special diets which don't contain the toxins found in the leaves these worms eat))
Termites may also be a great nutritional food source for bearded dragons..but I am not 100% sure of it. But again, wild caught termites can contain toxins from insecticides...and are most likely banned to keep as pets or to raise as feeders because of the harm they do to wooden structures.
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PHLdyPayne