Well, good luck with that. But you'll get much better yield from new tomato plants every 3-6 months. Given the right growing conditions, tomato plants will reach your size limit of 2x2x4 in about one month (6-8 weeks from seed). Then once the tomatoes have ripened and been harvested, few new branches, and thus tomato's will grow in that small space (given your pruning plan). After about 6 months or so, you'll just basically be trying to keep alive a large root bound spent twig. Though you can always give it a try and see what happens. But, commercial tomato farms want high yields, and they simply start new plants to regularly replace the spent ones (2-3 times a year). And their tomato plants are much larger as well (8-12 feet tall). I would imagine if it were productive to use the same tomato plants year after year by just pruning them, commercial tomato farms would already be doing it.
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