Please don't take this wrong, but you are truly ignorant of plant or animal biology. Under your theory, since we have plenty of elephants, and tigers in zoos, who cares if they are all poached from the wild. We will still be able to go see them anytime we want. Who cares if all the dolphins die out, sea world has plenty of them.
Now let me tackle you example of you reproducing with a black chick. Reproducing the genetic clones, like tissue culture vft's, are more like you reproducing with your sister. I think we all know that the offspring will have a high chance of having some genetic defects. Now say all your and your sisters offspring reproduce with only siblings and cousins. I don't know what the effects will be, but I'm sure the offspring would have a high mortality rate and some very serious birth defects. Pretty soon your genes wouldn't die out and not be passed on into the future. Same thing with plants. If you keep cross breeding the same genetic material, each offspring will be weaker and weaker.
I think your position on removing plants from the wild is the biggest flaw in humans. The only think we care about is making money, and to climb the social ladder. I got to have more than my neighbor has. The more we take from the earth, the sooner mother nature will end our rein on here.
Every plant and animal has it's place on this earth, and it's not in a zoos cage nor in a pot on your widow sill. We are so conceited to think vft's are ours to take. They belong where they have grown for thousands if not millions of years and that's around the Carolina bays in North and South Carolina., You need to realize they are not dying out, they are growing and thriving in the area they belong. The problem is that so many people from Ohio, New York and New Jersey what to have a winter home on the same land that belongs to the native plants and animals that was here way before we were.