1. There is no power to make new gezerot in our time.
2. Rav Yosef Albo says (Sefer HaIkarim) that the Dor HaMabul’s basic mistake was thinking that because they had to be vegetarians they were on the same level as the animals and should therefore act accordingly. Thus, the children of Noach were explicitly allowed to eat meat. Rav Kook also says that vegetarianism is not for our time but only after Mashiach comes.
3. There already is “kosher pork”.