Yes, that's my impression too.
Sort of an old-school definition I was hanging on to I guess.
(See my capitulation below)
I liked your Rhizobium example.
I work in agriculture, insect ecology and IPM so I like the insect and plant examples also.
The ant-aphid mutualisms are interesting, especially considering certain species of aphid predators and parasities have evolved special adaptations to fool the ants or defend against them, including waxy secretions and chemical camoflage. All so they can get to the aphids that the ants are essentially herding like cows.
I guess (to get this back on topic) one of the ways domestication is most likely to lead to macroevolution is via inadvertant side-effects on the ecology of unrelated organisms.
For example, I study sunflower pests. We have changed the sunflower plant so much in domestication that it has an entirely different community of insects (all native insects, incidentally) boring into it than the wild sunflowers do, even though they are still the same species of plant. We have a longhorned borer that has become a serious pest of cultivated sunflowers and now has even colonized soybeans, and it is now really hard to find this insect in any of its original wild host plants. It is coming to specialize on crop plants exclusively - they are more nutritous and more available. I don't consider it likely to speciate any time soon, but we have inadvertantly created a very different species without necessarily precipitating a speciation event.