What do you suspect woudl happen once Bitcoin is as big an economy as many of us believe it will be? Do you honestly think that Bitcoin wise engineers will not incorporate spot heat co-mining in such infrastructure?
Some bitcoins will always be lost but the effect will be astonishingly small; people are not going to accidentally lose several percent of their money per year. The real issue is growth deflation. As the economy grows the same amount of money can buy more stuff than before simply because the stuff is cheaper to produce. That is cheaper measured in real resources such as labor, electricity or steel.
This kind of deflation is very beneficial because it is interest on a loan, the return of a real investment. The money consumes no resources and is entirely useless until it is spent. The seller hopes to regain the value lost in the sale in the future, by spending the money. In effect, the seller has lent out a real resource with hopes of getting paid back in the future.