I find this topic very interesting. It is my opinion that the truly good shops will survive. We are in a totally different age when it comes to a lot of things. The truth is that someone with good mechanical aptitude can watch a few YouTube videos and figure out how to tune a derailleur, bleed brakes, service their suspension, install new cables or hoses, even service hubs and bearings, and true or build wheels. With some tools and determination a lot can be done in the home workshop. That in no way replaces the years and years of knowledge gained by experience of a good bike shop wrench but it does teach you whole hell of a lot about your bike.
There are a lot of people who do not care to wrench on their own bikes. There are times when the average home mechanic gets in over his head. Those people will keep good shops in business. The good shops who care about making good customer relationships will gladly work on internet bikes. They will succeed and be able to charge what there service and knowledge is worth.
The crappy shops won't last. While they hopefully aren't too common, there are shops out there counting on the premium they can charge for bikes to stay alive. They don't care about providing good service or really making customers happy. I know this all too well. I've been mountain biking for about a year now. My first bike was a very entry level hardtail. In July I visited a "real" bike shop to purchase my first full suspension bike after doing months of research. Sadly I had not discovered this site yet so I had no way of knowing if the shop I chose was decent. Anyway, I though I knew what I wanted but they convinced me I was wrong. They had me take a bike for a spin in the parking lot which was a worthless experience. Then they sold me a different model bike altogether that they didn't have in stock but assured me the sizing and fit was the same as the one I rode in the parking lot. What did I know? I was a noob (still am). I took their word for it. They couldn't have been more wrong. I never got comfortable on the bike I bought as it was the wrong size for me and even the wrong type of bike for how I ride. I tried different stems and adjusting the saddle, etc. It still didn't fit well and I still didn't like the bike. Don't get me wrong, it's a great bike; it's just not right the bike for me.
Fast forward 7 months and I just bought a YT. They provided good service throughout the purchase including fit advice. I love the bike and my other bike is now up for sale. That is going to cost me dearly. I'll probably take a $1,000 bath on that bike (hopefully not more). To say I am not happy about that is an understatement. I will not shed a tear when the shop I dealt with goes out of business. Looking back at the whole thing there were many red flags. I just didn't know what I was doing and put too much trust in what they had to say because they claimed to be real cyclists. It was a hard lesson learned.
I now know there are great shops out there like Halters and Hilltop Bicycles, just to name a couple. If I had bought from wither of them in the first place I would have been well taken care of for sure, but I had a bad taste in my mouth and just had to try something different. I am pretty sure that if I get in a bind and need help I can roll my YT into either of those shops and they will help me out. I would fully expect to pay a bit more than a customer who bought a bike there and I would very happily do so.
I don't think the bike shop is going away. I just think their business may be shifting a bit. The ones that adapt and change with the times will be fine.
I know I am probably in the minority here so please don't hurt me.