Nope I was addressing point #1. Perhaps you should reread what you wrote. 
I re-iterate you missed the relevance.
1. You can't increase the key size of the historic chain.
2. Cracking historically spent coins is not a threat. The threat is cracking anonymity history at any time in the future.
3. The crack threats are not just due to key length. Key length won't help you in some cases against math discoveries, and certainly won't help against quantum computers.
4. Your heirs won't be dead in 10 - 15 years (or less or slightly more).
5. Why risk it when there are possible designs where you don't have to.
2. Cracking historically spent coins is not a threat. The threat is cracking anonymity history at any time in the future.
3. The crack threats are not just due to key length. Key length won't help you in some cases against math discoveries, and certainly won't help against quantum computers.
4. Your heirs won't be dead in 10 - 15 years (or less or slightly more).
5. Why risk it when there are possible designs where you don't have to.
And those aren't the only inefficiencies in Cryptonote that can be eliminated with other possible designs.
As I wrote upthread, I never understood why people were so quick to jump on Cryptonote as the Holy Grail of anonymity.