I don't think this is the reason at all for doing away with external memory. I tend to think it's 1 of these 2 things...if not both:
1. Space inside the phone is at a premium nowadays. We are demanding more and more from our phones, while also maintaining the thinnest profile. It's getting more difficult to pack so many features inside such a small space. Doing away with the external SD slot frees up space.
2. Vendors and more specifically the carriers, want you using the cloud more. This in turn gets you using more data. By limiting the storage on your device will likely get you to start using cloud storage more, and then more data. Don't be fooled by this thought one bit. Cloud storage was being pushed to consumers shortly before unlimited data plans went away.
#2 got me using it more when I got my Galaxy Nexus. I store most of music now with my Google Music account; except for my custom mixes. I keep these local on the device. This allows me to free up some moderate space for keeping a few movies on my phone as well. Regardless, I think the G2 is going to be my next phone in a few weeks. I'm ready to ditch my GN after 20 months. It has been under-performing big time over the last few months.
I think all the reasons mentioned above are possibilities. However, Google has already said that they are moving away from SD because of security and stability reasons.
SD card is major source of pain for security reasons, esp. if you're looking into becoming true business devices where security is paramount...and why Blackberry (and lately Apple) has had a strong foothold due to security measures to prevent theft and leak of info on the phone. If you notice, then you will see that Googe & Samsung (and soon all Android makers) are now aggressively aiming for businesses.
In addition, SD card memory is not exactly the poster child for stability! How many threads have we seen where the SD memory has become corrupt?!
App developers also have moved away from SD storage because access to it is not smooth nor reliable. This is why very few apps now allow you to move to SD card, even if you are able to.
I am sure that space constraints and push to cloud may have something to do with this as well. But, security and stability reasons are the main factors IMHO...and also Google's stated reasons.
For me, I prefer SD because I have about 10GB of music (imported from iTunes) that I need to store on my phone for quick access anytime. I am on Sprint and, at my work (and the journey there everyday), I have only 3G. We all know how slow Sprint 3G is...I cannot rely on streaming! I have not rely on Google's music because I don't trust its quality...and from seeing their movies quality, I will stick with iTunes!
I do like that my photos taken with camera is stored on SD to offload my internal memory (on Note 2). However, I am sure that if I was running for political office in NY and someone steals my phone (or SD card), then they can post my family jewel pictures on TMZ.
So, I have mixed feelings about SD card. BUT, the
biggest complaint I have about LG G2 is the lack of removable battery! I am a heavy user because it is my work and pleasure phone. I charge it constantly...due to both habit and need. Since my phone is my pager (for work), I cannot afford to let battery run low at any time. With my frequent charging, I will kill the internal battery (decrease battery life after each charge) before the 2 years is up! I sure hope that LG G2's battery is durable!