I guess Amiga (accelerator) market was already dead by the time WinUAE reached this speed.
Usually, emulators have no impact since new machines that are many times faster get released and new software get written for it.
The problem with the Amiga is that the new machines aren't that fast, and people tend to not update (because it's expensive, there are little to no software written for it).
In this case, emulation could be seen as a problem. But seriously: there are so few people using Amiga today, does it really make a difference ?
he talked about the past...
But even if, the main problem for a long time regarding commercial projects is that you cannot earn money or better you can earn more on other platforms. When I digged around in aminet for my distribution it became obvious that there was a lot of 68k activity till around 1997/1998 then it went down considerably. The last updates for commercial software were about 2000. If activity went down 1997/1998 I assume that this was both the case for users and developers. So in this atmosphere of a rapidly shrinking user base no commercial orientated developer or company would invest time and money and the "hobby" projects that are only based on idealism often fail without any hope to make money with it. Developing is time consuming and on hardware even expensive.
Short conclusion: I think WinUAE has saved the remainders, the damage was already there
Why is all closed? Why are some people bashing each other or talking bad about others instead of working together? I do not know. And I think it will not change. The platforms are like trains that are driving in different directions so it is best to decide for one and jump on the waggon.