Gladwell based his quotable theory on some research, and it wasn't a new idea.
In terms of a thousand hours to viable product, there are just far too many examples of products that have become successful in less time for it to be a theory. eg.
* first version of Facebook was ~2 weeks of code
* chatroulette
* Inviteshare - built in 24 hours and sold to Techcrunch the next day
* First version of Crunchbase we built in 48 hours
* all the 24 hour hackathons that have released products
* you can pull together various bits of open source software with some glue and a stock template and have a product in 24 hours
There are heaps of other examples of products launched with 10-200 hours of work that became hits, I am sure others can suggest more.
While you may have come to this conclusion by looking at your own two examples, it definitely does not apply across a broader spectrum.