If you lost some BTC it doesn't destroy any value. It just means that you allowed humanity to forget that it owes you some of it's wealth. If you lost some BTC the fraction that humanity owes all other people who own bitcoins just increased.
No actual worth is lost. You just lost the proof that you have a right to something useful or pleasant. It will be claimed by other people. Market will discover how much bitcoins were lost and bitcoin price will raise accordingly so other people holding bitcoin will be entitled to tiny bit more of the valuable things that society provides.
If you break your glass bowl it's a loss for the humanity. If you loose bitcoin wallet it's just a loss for you.
Of course, the chance that huge amounts are lost together is quite low.