1. Increasing number of attacks
Attacks become harder over a long time because developments in hardware can allow the blocksize to gradually rise, which means that they have to spend more to push the transaction fee up to the same amount.
forks
Forks are irrelevant. That's the market's decision.
and ransomware
Fair enough. I would be using Monero by now though.
2. A limited number of available coins
That's a good thing. There are more than enough units because each coin is 100,000,000 units.
3. Increase in complexity of Bitcoin mining
That happens naturally from the price. If the price decreases, so does the difficulty.
4. Slow processing of transactions
5. Increasing transaction fees
Fair enough. Those are scaling problems which will hopefully become less prominent with Lightning and other solutions.
6. Price fluctuations
That's always going to happen in an asset unless it is globally adopted. The same thing happens with gold.
At least it's not just decreasing forever like fiat though.
7. Lack of malleability within the network
?