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This are just estimates and theres many so i initially added them to post then decided its not solid enough to leave there :)
Feel free to share links that you found

Yeah isn't this a huge problem for bitcoin. I mean if the bitcoins are always lost, it will be so hard for new people to get and hold them. Maybe an application can replace bitcoins that have not been moved for a certain amount of time.

It's up to us to decide how much a Bitcoin should be worth and estimating how much coins are lost will help with that. People have looked into it before, but not enough effort has been put into it and not enough data has been publicly shared in my opinion. But it's only a matter of time before people realize there is less available supply than expected and then the price with naturally increase.