Getting the data to the cell tower is easy - the problem is that the only way they can expand the bandwidth from the tower to the phone is by having more wireless spectrum which is expensive and regulated, and there are technological limitations as well (if you wanted gigabit to your phone you couldn't really have it at any price).
It seemed to me that the GP was lumping together all ISPs (wired or wireless) since he was talking about peak usage being on Friday and Saturday nights (which only makes sense for wired, not wireless). Also, I don't buy that Netflix is the top internet traffic on wireless ISPs since most people would blow through their data caps in relatively short order watching Netflix. Although I do not have the data to prove it one way or the other.
If restricting the discussion to wireless only, then I agree that the Netflix Open Connect strategy is less helpful, but I think it still provides some value.
I agree that with wireless, there are more tangible and effective limits on bandwidth than with wired. However, I think we have a long way to go before they are realized in most places.
I would also argue there are other solutions other than simply more EM spectrum. Specifically, in most places there is room to have denser packing of cell towers. Since cell phones will negotiate to the nearest/strongest tower, adding additional towers will reduce effective congestion since less people will be communicating with each tower. Obviously there are diminishing returns because eventually the towers will be so tightly packed that there is little differentiation between the closest tower and the next closest tower which results in interference and call hand-off problems.
While this effective cell tower density may have been reached in parts of the densest cities (e.g., NY) and/or sporting events, I think there is ample room for growth in most places. Admittedly, new towers are very costly (permits, installation, maintenance, etc.), however the wireless ISPs need to do a better job of reinvesting their profits into infrastructure to address this issue rather than blaming their customers. It is like they are upset their customers want to use something that they are paying for and then not investing the money to actually provide it.