I believe bitcoin deflation is normal because it is decentralized.Meaning,it's not controlled by government.People should not worry about bitcoin deflation because, surely there will also be an inflation.
Being a deflationary currency means that more people will tend to hold it since its value increases over time--hindering its capabilities of becoming an actual currency. This actually focuses less in its aspect as a currency since a currency that is not circulated well is not a good one.
it is true that bitcoin is no longer used as a transaction tool, even though bitcoin was created to be used as a substitute for money, but with a limited amount and increasing prices continuously cause bitcoin to become an investment object like gold