should we add proof of stake to the bitcoin? NO
should we increase the supply limit (i mean to have more bitcoins)? NO
is the maximum supply (apparently) good? YES
is the bitcoin deflationary a good deal? YES
is bitcoin sustainable based on supply? YES
would you sure that newbies would be easy to get with bitcoin in the future? YES
The number of bitcoins that will ever be available should never be changed. It's 21m and that should be set in stone.