The first thought is to replace them, but I love them and it would be like giving away a favourite pet. Furthermore, many misguided people spend good money to buy brand new clothes with just this level of wear carefully built in (I've discussed such dishonest and objectionable distressing of clothes before, see Patina and Style). So, I'll continue to wear them with pride.
If you're desperate for worn chinos here is some advice from Ask Valet about ageing them artificially. Personally I'd rather wear out my trousers naturally than cheat by getting out the sandpaper.