While some say we run out in 2149 due to the multiple 1/2s slowing down the issuance of the remaining 3million coins.  I suspect a push to close out stale wallets will occur at some time after 2059.

Many banks grab your money if you never touch an account.

So the idea of grabbing a stale wallet that has never had any coin removed from it will gain momentum down the road.

To those that say what happens if I want to let it sit and not cash it.  Well duh go to the wallet you let sit for 49 years and mover the coins to a new address.  You are still anonymous  no tax issue as it is only a transfer from 2 addresses you both control.

I most likely will be dead in 2059 but I would be very surprised that grabbing stale/abandoned wallets does not happen.

If it happens and say 1 or 2 million coin are put back into the rewards we could last way past 2149.

Somining the last bitcoin is at least 128 years away but I suspect it won't be for more than 200 or 250 years.