With all these new gTLDs everywhere, I am wondering what would happened if I bought a domain and the operator of the gTLD behind it went out of business. Will the entire gTLD and all the second-level domains registered under it disappear? If this is what is going to happened, then I guess these new gTLDs are not reliable for any serious project. I am interested in reading your opinion about this.
ICANN would take control and find a new operator. There is a pretty long and tedious process involved with operating a gTLD, including proving that you have the appropriate finances and resources to support the domain.
No, they would not disappear, there is a specific procedure in the ICANN new gTLD applicant guidebook for this issue. No change for the end user but is is possible that transfers or special zone file operations would not work during a certain period of time. This has not happened yet so...difficult to answer.
I suggest you to read the story of <a href="https://en.wikipedia.org/wiki/RegisterFly" rel="nofollow">https://en.wikipedia.org/wiki/RegisterFly</a> .<p>That was only a registrar, not the central gTLD registry, so I imagine it would be worse.