Here's my 2 cents on your argument:
300Mbps = 37.5MB/s
BDRX - Min 25Gb, usually more, but for ease of calculation for me I will just put it at 25Gb
37.5MB/s is good enough to comfortably download BDRX without feeling slow unless you are some impatient guy.
Scenario 1: You expend 37.5MB/s 24/7 to download BDRX content (unrealistic use)
At this kind of speed, a 25Gb BDRX should be able to complete within 15 minutes, and that means 1 hour u will need 100Gb of harddisk space, 2.4TB in a day 16.8TB a week totaling 672 pieces of BDRX content. Each BDRX if feature length, should average around 2 hours, which means to watch everything you need 1344 hours or 2 months (assuming u stay glued to the chair).
So in the end you end up buying alot of harddisk, and hording all that you have downloaded, which you may or may not even have the time to consume it. Some people really do that, buying 4TB hardddisks, set up the array of external harddisk enclosures, but not for me no thanks, not critical for me to have 37.5MB/s 24/7/365.
Scenario 2: on-demand 37.5MB/s (more realistic use)
The most realistic case is that you wanna watch something in peak hour and don't have to compromise on the content quality, can still grab BDRX because you know its gonna finish in just 15 minutes and you can enjoy the content. I would love to do that but can do workaround:
I will just download when I know I can get full speed.
I can still achieve the same ends, which is to enjoy a movie I want during peak hour. Its just a different means to an end. And for this end, I get to pay a lower bill too. Didn't lose out at all.
The thing now with MR (vis-a-vis VQ) is the strange lack of customer service, the twitch tv, and the funny problems faced by individuals or small batches of people. Maxing out whatever time of the day, I think its not very important. (Did you not realise that there is few, or none of the complains got to do with hitting beyond 500Mbps in real world downloads?)