Pretty good. There's actually a number of other cons that could be included, but you've picked a classy assortment of concerns to publish.

I think arguing the decentralised issue is lacking the understanding of what decentralised mean.

Bitcoin isnt reliant on a single point/entity thus it is decentralised according to the meaing of decentralisation.

Bringing in an argument of, "Its meant to survive a nuclear attack" or anything like that is pretty daft. In the case of nuclear war, the last thing people will worry about is their money and I can promise you if there is one nuclear bomb hitting a powerfull nation then there would be one hitting every other powerfull nation which would cripple even the internet.

1) Waiting for confirmation is only necessary if you don't trust the counterparty.
2) Without the early adopters securing the embrionic block chain, bitcoin might have failed and wouldn't be where it is today.
3) Transactions with paypal and credit card are even less guaranteed. In fact, a lot of them do get rejected and reversed at the whim of those companies.
4) User friendly backup tools will all but eliminate coin loss in practice
5) Bitcoin doesn't rely on the whole network to be intact. It could easily survive even just on a handful of clients running in the whole world.  Splitting the network requires hermetically sealing one group of clients from another group. That is extremely hard to do on the internet.
6) User friendly security tools will prevent most theft in practice
7) Nothing is backed by anything. Even promisory notes are only as trustworthy as person making the promise. With bitcoin you don't need to trust anybody.
8 ) Early speculation means that difficulty is higher than it would be without speculation, making bitcoin more secure in its early stage, making it more likely to succeed.
9) A lot of hoarders have started bitcoin business exactly because they have a stake.  There will always be free riders in life.
10) Do you really think people are going to care about a fixed 0.1 cent transaction fee? c'mon...
11) Bitcoin is just a tool. If some people use that tool for ideological purposes, why do you care? You can use it for whatever purpose you feel like.