There are some people who doubt it in the future, but I don't mind understanding them.. everyone has their own opinion and I rather believe Bitcoin will be even bigger in the future. There are still many large agencies who are interested in Bitcoin, so I don't think they will just abandon Bitcoin without a good reason.
If there are some people who doubt it, they don't need to invest in Bitcoin. It is not a must to invest in Bitcoin, we have our right to invest or not. Sure, there are always people who are interested in Bitcoin. Even top people in the world are interested in Bitcoin. Elon Musk is one of the top people who are interested in Bitcoin. His company, Tesla, becomes one of the top company which invest in Bitcoin.
MicroStrategy still seems interested in Bitcoin, which is enough to prove that there is still hope to make money from Bitcoin. It could be that this is still the middle stage for Bitcoin's growth.
MicroStrategy keeps buying Bitcoin, they always show a positive gesture. When some people begin to feel doubtful because of FUDs, MicroStrategy buys more Bitcoin in the red market. However, I'm not those people who doubt Bitcoin, I always believe in Bitcoin future. With more massive adoption in Bitcoin, why we must feel doubt of Bitcoin future? It is a clear sign of great future of Bitcoin.