You could also fix the early adopter/bitdust problems.
1) Any unspent coins generated/transferred but not spent since the first 18 mos of the network are deleted.
2) Unspent balances less than .01 are gone
3) Coins older than 12-18 months are divided by 2. Coins 18-24 months old divided by 4. Coins 24-36 months old divided by 8, and the rest are older than 18 months and are deleted.
4) to prevent windfalls to mt gox, who hold a bunch of accounts and won't give that money to their customers in the new chain, cap btc address balances at 100 BTC (currently $10k).
This might reduce that 11 mil number to like 7 or 8 mil. you then increase the total coins to ever be released to 100 mil, so current users wind up with 7-8% of the total future supply.
You could form a genesis block that has a special coinbase. All the current unspent addresses would be the coinbase with balances next to them.
Then you could come up with an adoption schedule over the next 10 year:
No I would never ever touch the earlier coins- that would certanily be a disaster. And the early adopters arent a problem. The problem is that there are not supply for tha large masses to enter - who now are completely left to the grace of the early adopters.