From the moment you started focusing on the result (becoming a better programmer) and you forgot to enjoy the journey (why would you ask if you should go through the lectures of a recent Coursera course if that's something you enjoy doing?) you failed.
In my opinion, do what you enjoy doing, nothing else matters as long as you enjoy what you're doing.
This has the potential of making being rich kind of...obsolete.
Think of it like this: can't afford an iphone? There's a Holographic iPhone you can download. Can't afford a fancy big screen TV, there are thousands out there you can download, etc.
This will all depend on the quality / ease of use of Holographic Windows, but I can already see it's the future of computing.
The last few major purchases I made with my relatively plentiful disposable income: A pair of Doc Martens, two plane tickets to Kenya, yearly membership fee to my concierge medical clinic. None of these could be replaced by this technology. Arguably, I could make it look like I'm wearing new shoes when look down, and I could load up "Kenya" mode on my Holographic Goggles -- but nothing will replace the feel and protection of good shoes, or replicate the smells, tastes, and adventure of actual travel.
Also, I still own an iPhone 5 and don't have a particularly fancy TV...
Your same argument has been made (to a greater or lesser degree) with the advent of the industrial revolution, the Internet, cheap processors, 3D printers. There is no technology that will make wealth obsolete.
The project looks great, but it's ironic that it uses github.com to host itself [1].
The only message "not eating your own dog food" sends is this: "we're not doing it for ourselves, we're doing it for those who might find it interesting", which in turn sends a strong warning about the lifespan of the project.
It's possible the project doesn't (currently) have all the features they like when hosting on Github. Nothing says the project won't be moved in the future.
My reasoning was "what if an HN reader is trying to rent their apartment in Paris". The probability is so low, but for problems that are not usually recurring, you can find help in the most unexpected places.
PS: I am not relying on HN for this, I am using other rent specialised services as well. This was just a message sent out in the universe, if caught by the right eye I'll go from 0 to 1, otherwise, I am staying in 0, not going to -1.
In my opinion, do what you enjoy doing, nothing else matters as long as you enjoy what you're doing.