can a BTC exchange be terminated before it has been affirmed, or is it that once communicated it is beyond the realm of imagination to expect to drop whenever
I think you are taking it from the standpoint of an exchange. There must be a problem from the exchange, because this sometimes happens. If it does, the best you should do, instead of waiting for years, is to contact the support of the exchange and make enquiry on why that is happening. I believe it will be solved.