Yes, you could live off of them, but not very well. The current selections have low fat, low salt along with the regular stuff.
The pasta dinners, after a while, all taste the same. Nothing like nuked cardboard! The Chinese ones start tasting the same instantly, no matter which one you take. Switch to Mexican and you get the delightful flavor of cardboard burritos or whatever and the fillings all taste like they were fixed about two years ago. (If they actually come from Mexico, they probably were. Plus no doubt contain a real healthy dose of DDT.)
The diet ones are basically pasta with additives. After eating a bunch of them your taste buds get ready to suicide.
The regular ones vary in flavor, best – in my opinion – is the turkey and dressing, then the Salisbury steak, followed by roast beef, beef tips, chopped steak, and lastly, breaded chicken. Chicken does not seem to do well in TV dinners. Then again, I never have been fond of reheated chicken in any form, noticing that the flavor changes if it is cooked and then allowed to set for a day or more in the cooler. Avoid the pasta meals also. The Ravioli turns into pasty cardboard which the addition of new sauce cannot help.
Anyone trying to live off of those things had best take daily dosages of vitamin B, E, C and A. It would be like trying to live off that Chef Boyardee crap. (Paste in a can.)
I’m a bachelor. I know. I had to learn how to cook out of self defense – and do a pretty damn good job of it I might say – because I ate my way through almost all of the TV dinners, Chef Boyardee, canned spaghetti, ravioli, spaghetti-O’s (Mistake there), frozen Chinese dinners and even those canned Mexican things like beans wrapped in corn husks. Spam became a welcome favorite.
Then, I am ashamed to say, I ate those frozen hamburgers, sandwiches, hot dogs, and sausage-in-a-biscuit things. (Heartburn city) I even bought the BBQ in a BUCKET and no amount of doctoring up could improve it. (Dogs liked it.)
If you want to get a reasonably well balanced, easy, tasty meal, get a Publix all-the-way sub sandwich. Delicious!
Or, do as I do from time to time. I saved TV dinner trays and sometimes I cook up a bunch of stuff, reload the trays and freeze them. My own TV dinners are far better than the store bought stuff.