It's an achievement and a milestone, undoubtedly, however, what's more important is whether it will be able to keep that lead for very long because Bitcoin is a highly volatile asset, it gains value over time but it loses value as well later on. If it's market capital is worth more than silver's today when it's priced above $70k, it will be lower again once it drops back to $50k or even $60k, that is the biggest thing that matters in my opinion.
We should also not ignore the fact that Bitcoin is more scarce than Silver or even Gold, the supply of Gold and Silver is way higher than Bitcoin, which makes Bitcoin gain more value than them based on the demand if it keeps increasing and this is what made Bitcoin achieve this.
You are making a lot of sense, the scarcity of a commodity makes such commodity very valuable, sometimes I also thought of something, I feel that the limitation in the supply of Bitcoin is the reason for its price increase over time and dominance in the crypto market., volatility has help bitcoin to remain relevant as long as crypto currency market is concern.
The bitcoin market is a seasonal market and every season has what it brings to the market that's why every knowledgeable bitcoiner will always tell you that you shouldn't be discouraged because of the volatility of this digital asset, the major concern of every potential investor should be targeted at his long term journey.