indeed , pin yin is used in china since 1949
but it is not that case in taiwan and hongkong
pin yin is just a tool to learn chinese
since i was a kid ,i learned chinese using pin yin
if you read pin yin,you may think it is like english or some other languages in EU
but chinese will never ever be replaced by pin yin
because yin pin never shows any beautiful sense
but hanzi ,the chinese charactors , has a beautil handwriting figure
it is a kind of culture in the long history in china which can originated one thousand years ago or more