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?
There will only be a total of 21 million bitcoins available in the market (that is, once all bitcoins will be mined). Currently, there are already around 16 million bitcoins mined by btc miners (that is around 76% of the total number of bitcoins). Once all bitcoins were already mined, there are 2 scenarios that might happen on btc price: it will either rise up (if people will keep them or maintain the circulation of it in the market/trading sites) or will fall down (if people will sell all their bitcoins).
Putting that into perspective, increasing the total number of bitcoins (from 21M to more than that) will greatly affect the future of bitcoin and might make the people lose their interest on bitcoin.