Thanks for your replies.
I want to give my opinion here.
I think a good way to circumvent this problem is to not to limit the amount of BTC to 21M. Instead it should have a deterministic inflation rate of let's say 1%. This would have 2 benefits:
First the concept of mining as it works today could go on for ever. Secondly, deflationary forces such as loss of BTC, could be compensated for.
I general inflation as it is today is not a good thing cuz it takes monex from the savers to the speculaters, but if the inflation rate is small and deterministic it would be a good compromise.
What do you think of that?
There are pros and cons to that but it is highly unlikely (as in IMHO impossible) the core principals of Bitcoin will be changed this includes things like
* tx are irreversible
* so called "lost coins" are stolen (a variation of reversible txs)
* the mining reward will be altered
* the 21M BTC capped will be removed or raised
Bitcoin may be patched for improved functionality and better security but due to the need for a consensus it is highly unlikely anything controversial change will ever be adopted. The good news is Bitcoin is open source. You can always make a competing coin and let the free market decide.