The problem is that if more will lose wallets and bitcoins, network itself will suffer, now you do not feel lost bitcoins because demand is low. When demand will increase in 50 years, then all those 4mil coins will matter . I do not offer a solution for owner that lost money, i offer solution for healthy of network. The owner of lost wallet have no chance to get back money, but network will keep entire coins in circulation.
Anyway i do not see bitcoin as a single global currency. So, for me personal i do not gain anything . I think even those who lost wallets will agree to let those coins return in circulation as a reward for mining blocks.