Ultimately, it's up to individual investors/savers to make their own decisions about where to invest/save their money. However, by being informed and taking a long-term perspective, they can help protect themselves from some of the risks and pitfalls associated with investing/saving in a rapidly changing and hyped arena.
Mungers views should be discounted by anyone with more knowledge on the bitcoin topic than he has. (Everyone).
Retail is the main audience of his comments. retail investors can be particularly vulnerable to these kinds of tactics, since they may not have the same level of knowledge or experience as professional investors. This can make them more likely to be influenced by marketing or to follow the herd mentality, even when it may not be in their best interests.
If Charlie can turn the Bloomberg retail crowd to his point of view it can only help him keep the advantage he amassed over the last 9 decades due to advantageous market conditions.