Other currencies have attempted to fix this problem, such as Zcash. But I think it will be hard to escape the volumes of metadata created through transactions on merchant websites. Ultimately, your spending habits and browser cookies will say more about you than your BTC address.
There hasn't been any vulnerabilities in the code affecting anonymity. Saying there will be vulnerabilities in the future is FUD.
Trust is a personal preference, but the code is open to all to analyze.
> Saying there will be vulnerabilities in the future is FUD.
Saying there will be vulnerabilities is 99.99% likely to be true. All software written by humans is highly likely to have mistakes. Remember Heartbleed? The code was open for all to analyze and used by millions, and yet we recently found a vuln that allowed attackers to dump the entire memory of a server. Open source is no guarantee against vulnerabilities.
Default assumption should airways be that there will be vulnerabilities.