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Will Bitcoin become better if any of these become possible?
As we know Bitcoin is not controlled by any central authority and is not centralized. The demand and supply of Bitcoin is not controlled by anyone so no authority can control the price of Bitcoin. In any case, the point you've raised certainly won't have much of an impact on Bitcoin's price. However, the market may be slightly dumping for a temporary period, but later it will rise again.
There’s no reason that bitcoin will be backed by USD as both have opposite currency feature. While USD is solely controlled by the government, bitcoin is never controlled by any third party except of its user or hodler. If ever the time comes that will be possible, maybe we are not talking anymore about bitcoin but USD in the form of its digital currency.