I heard that many people lose their coins and the current volume of BTC is not current at all)
How do you think will Satoshi add some in future?
it is not called volume it is called cap or maximum number of coins to be mined.
and the amount that people lose or have already lost is not that much to cause any concern yet to warrant increasing that cap.
also bitcoin is not centralized like other things you may know so Satoshi can not do anything about that. it is the whole network that should decide something like that in a hard fork if needs be.