Can we imagine new gTLD Entrepreneurs with a minimum technical knowlege to become their own back-end Registry AND Registry in round 2 of the ICANN new gTLD program?
Come on...give the ICANN (or the next governing body) 20 more years to fix this and we should make it. Internet is only 25 years old and new gTLDs are celebrating their first year of anniversary.
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.