anybody who has been around for a little while knows the horror stories that come from those who short bitcoin...
anyways, this may sound a little strange but i am actually glad that they are saying these things publicly. if we can get some of the newbies who are only in bitcoin for the "investment" part an to "make money" out of it then the result of all this is positive. it is also known as flushing the newbies out.
It is really flushing the newbies out since they will be afraid to put their money into bitcoins since Bill Gates have planted the seed of fear to them. Bill Gates has 46.1 million followers in twitter so you can imagine that if those numbers read his comments and believe then a huge number of people will no longer invest in bitcoin. But let is just hope there will be no big negative effects on bitcoin economy as a whole.