There are many reasons that people are selling their btc for fiat is because there are businesses that are not yet accepting cryptocurrency as a means of payment. This is the case in my country though, but I think that the mobile applications that are used for transactions is making a name for themselves because they can help in making transactions cashless albeit the currency used is fiat and not cryptocurrency. You might be disappointed that people are selling their crypto but these are tough times and people are not like you who have the patience to hold, it might be their last resort or not. Atleast understand how people live their lives.
Exactly. Bitcoin is still behind Fiat when it comes to merchant acceptance. Nearly every store around the world accepts Fiat, but not Bitcoin. This is probably because the pioneer cryptocurrency is volatile in price. As long as prices are unstable, Bitcoin cannot be used as a currency like Fiat. Aside from making Bitcoin faster and cheaper to use, we should focus on making governments regulate the market to provide better price stability. With greater liquidity and mainstream adoption, it's possible that Bitcoin will be used for daily payments instead of Fiat.
Until then, people will continue to use Fiat in times of need (like the ones we're facing right now). Even with social distancing, it's still possible to conduct transactions with Fiat using a credit/debit card or a payment processor like PayPal. As long as people trust Fiat, Bitcoin will be used by a very small margin. Now that governments around the world have started to print more money than usual, inflation will rise like never before. We'll reach a point where people will no longer trust central banks and Fiat currency itself, leading towards increased demand for Bitcoin and other cryptocurrencies on the market.
Nonetheless, the smart money will "hodl" Bitcoin no matter what. The halving is about to happen soon, resulting in higher prices per coin in the long term. We may not be able to avoid "sell pressure" across the market as a result of the COVID-19 pandemic. But as long as loyal supporters of the cryptocurrency buy and "hodl" their coins, nothing should go wrong. Besides, Bitcoin continues to grow in development and innovation behind the scenes. Before you know it, scalability and privacy issues will be a thing of the past on the BTC blockchain. This, alongside reduced coin issuance, should lead towards a very bright future for Bitcoin. Just my opinion