I mean for prototypes, proof of concepts, and maybe 2 man fly by night 'startups' trying to get initially backing to hire backend engineers, great idea. I can even see certain 'startups' may be profitable and sustainable and just never need to invest in 'custom' backend code.
But as a general rule of thumb, in no way should software startups that base their existence on client server software possibly think its a good idea to have no one in house who actually knows how to do server software.
There was all this hype about how they were going to render C, C++, Pascal and COBOL programmers obsolete, because they'd let non-technical folks build production-grade software systems with ease in record time.
Of course, what ended up happening is that this didn't hold true at all. Most apps developed by non-programmers were quite limited and terrible. Anyone stuck with such apps often had to bring in actual developers anyway. Unfortunately, the developers were now stuck using rather limited technologies that often took longer to develop with than if C or C++, for example, had just been used in the first place.
Any serious software system will require lots of custom code, and this only comes about through the efforts of actual software developers.
Parse takes that model another step forward and just addresses the most common use case - CRUD applications that an experienced developer could create in their sleep but haven't we done that enough times already?
There will still be occasion when your own server/s are the best or only option but fewer than today's developers want to admit.
Its just not that hard to do a 'serviceable' back-end behind a simple rest API. I mean how many hours is that really going to take you, especially when you consider in the case of parse users they already know what data entities their application uses? A REST API for a dozen or so already defined entities, maybe a weeks worth of work? And then look at what it buys you, actual control over your data, ability to move from parse and pursue cost cutting alternatives, ability to do in depth analysis of your data...
I absolutely think Parse has great value, but when the statement is made that in general it might replace back end engineering for startups... its just wow man. This is precisely why a person who understands the server side of a client server application should in general always be involved if the business is based around client server applications.
The only thing that matters for a young startup is finding product-market. Parse makes that process more efficient than ever.
A person who understands backend engineering would understand the value that Parse provides.
Experienced developers are often much faster and more efficient. This is especially true if they're using a language like Python that is quite suited to prototyping, and already offers so much pre-made functionality in the form of libraries and frameworks.
Many of us have learned to be very skeptical of these services that claim to allow software systems to be build rapidly. This often only holds true in a very, very small set of cases. Otherwise, the moment you try to do something unique or unusual, you'll hit one roadblock after another. It doesn't take long before the supposed "time-saving" or "effort-saving" service has wasted more time and effort than it would have taken to develop everything from scratch.
EDIT: For the record, I really like Parse, and am a paying customer for two CRUD mainly products.