How exactly bitcoin should overcome the hacking problem?

First of all, most of them happen either due to bad security practices or using fake software. It's a matter of general security awareness and not the code/chain problem. Second, this is not exclusive to bitcoin as there are a lot of people who lost their crypto or savings from phishing, malware, etc. So, it's not about bitcoin creating a magic code to prevent hacking, it's about how people should raise their security awareness & practices.

The ease of use is the same. Using bitcoin isn't that difficult, but bad security practices make it prone to attacks. Holding 10 BTC is way easier than carrying a million cash, as long as you know that saving your seed on a plain text format is bad.