I would imagine this being a very tedious task.
Thete are so many satoshis being sent around the clock.
Would be tough to monitor all of these transactions.
yes you are right and lots of it kind where to be in this world without any support because they are lost by someone so finding all of them will be very difficult and making it again as a new currency will not be possible in many times.
Lets think of it in another way. The wallets whose private key are lost, the bitcoin store in them are also of no use and cannot ever be sold. So this means that actual supply of bitcoin is less than theoretical supply. As the time passes on more bitcoins private keys will be lost etc and therefore the bitcoin will become more and more expensive.