I really appreciate the zeal which you have showcased when you say you will buy bitcoin by selling all the alt you have at this moment but i would suggest you not to sell all the alt as there are some altcoins which has a bright future and can be a fortune as i still remember when ethreum and litecoin were altcoins for namesake and nobody use show interest in it eventhough they have great features like smart contacts and rapid speed transaction facilities which bitcoin still lacks but now look at the fortune of those alt holders hence invest into bitcoin but do not sell all the alts.