Don’t think so (that a Chinese internet will gradually take over). Regardless what people might think of America’s dominance in this, having a relatively free exchange of thought and content, and having one common language in which to communicate, are key ingredients of a successful www. Russians and now the Chinese will undoubtedly launch their own version, but that will only add to their isolation. If it’s the sensible thing to do to punish China that harshly, is another issue. China has become one of America’s largest creditors. Trump’s policy comes down to borrowing money from the Chinese, to give to American farmers, to NOT sell their produce to China and to incapacitate America to pay off its debts.