Mistwell
Crusty Old Meatwad
They don't have to ... I'm presuming it. That's the standard that I as a consumer require of WotC for me to consider them to be acting in good faith.
But, I'm not suggesting that they provide the same degree of support. Simply allowing sales of support material might be sufficient. I tend to require providing some way for the publication of supporting material.
I will note that a lot of the 3.5E web content is still available, so there is some support.
Now, forbidding others from providing support, through the 4E GSL, that to me is major bad faith.
If I may make an analogy: When you buy a car, a part of the value that you might be looking for is a healthy supply of parts and the ability to get service through a network of dealers.
If your manufacturer goes out of business, then you will expect that to be disrupted.
When new models are produced, you expect the available support and parts to be lessened, but not to disappear.
But, what if when a new model were produced, the manufacturer required the dealers to wholly cease to provide spare parts for the older model? And, the manufacturer required that any third party parts sellers to cease sales of any earlier parts, before being included in the new parts supply chain?
I think you are wrong. Car manufacturers support supplies and parts for a while after they discontinue a model, but it isn't indefinite. At some point, they end that support as well. All companies eventually end all support for discontinued products. You can vary the amount of time they continue support, but you cannot really expect indefinite support for discontinued products.