Be careful in what you say. Be careful in what words you use for they may come back and haunt you. Worse still they may outlive you, carved, as if in stone, in the collective memory of humankind for all eternity. Inventions have long since reached their limit, and I see no hope for further developments. Julius Sextus Frontinus, Roman Engineer, AD 10.
Radio has no future.
X-rays will prove to be a hoax. William Thomson, Lord Kelvin, British physicist, 1899. Rail travel at high speed is not possible because passengers, unable to breath, would die of asphyxia. Dionysius Lardner, British scientist, 1823. This 'telephone' has too many short comings to be seriously considered as a means of communication.