There is a ton of PC's with the NVIDIA GeForce 6150SE build in display card in them. One of my two systems have that card and it will not upgrade either. The question is are they going to do anything about it. I would assume NVIDIA has to come out with a driver that will power the system with W10. Even if they do then the question becomes will they make it available to be included in the ongoing OTA upgrades, or does Microsoft believe this is not their problem. How many other systems have the same problem with other display chipsets. This could get out of hand quickly and give Microsoft another black eye. Like they really need it. Win 10 should include a generic driver to get the system going and then you could download a driver for the 6150SE to get all its benifits. Then it would become NVIDIA's problem and I am sure they would do something about it.
I have a post a couple of page down discussing this as a pain point after release, and it is.
Does Microsoft believe this is not their problem? Frankly, it isn't Microsoft problem, they provide the update spec to the hardware manufacturers well advanced of releasing a new product. The device manufacturer chooses what legacy equipment to support and what legacy equipment not to support, Microsoft has no control over the hardware manufacturers decision or speed of development.
Will NVIDIA eventually develop a driver? I have no idea, I contacted NVIDIA directly and they said they will not discuss future development plans. If they have chosen to deprecate those cards completely, then they will never be supported.
Microsoft has a generic VGA driver that does work in some cases, and you can also try the Windows 8 driver - but neither worked well for me in Insider Testing (You and I need the same driver)
So, I did what I always do when a product has outlived its supported lifespan - I updated and replaced my old cheap graphics card with something newer and frankly, just as cheap.
So, yes, I think it is rather unfair of you to blame Microsoft. Blame the computer manufacturer, blame NVIDIA, but Microsoft cannot stop development simply because a hardware manufacturer has drawn a line in the sand.