So a year after win2k is released, your selling points are "basically usable" ( vs "highly compatible"), "free/[nerd-shibboleth]" (vs "hidden in the cost of a computer"), and "easy to install" (vs "already installed"). I think it's hyperbole to suggest that BeOS being open source would have dramatically changed the course of computer history. If anything, I think it's worth considering what would have happened to the already-paltry Linux Desktop experience if BeOS absorbed developer attention.
My point was basically what you're saying: BeOS was not nearly where Windows was, but it was miles and miles ahead of Linux, and it provided a unified graphical OS instead of the fragmented Linux base with all its duplicated efforts. Now, it's hard to say whether we the cascade of attention-deficit teenagers would have united behind an MIT/GPL BeOS and succeeded in producing something actually usable by people who were interested in doing more with their computers than setting up Conky and Fluxbox to post screenshots online, but I think the landscape might have looked different if it'd been an option. BeOS when I used it in 2005 or so was already curiosity, an antique, but if you take all the people who were working on Haiku (which started as OpenBeOS around the end of Be, Inc.), and throw in a handful of the people who were working on KDE and XFCE, starting from everything BeOS could do in 2001, instead of Linux and raw X, what do you have in 2005-6 when Ubuntu started picking up steam?
The conclusion one draws from this is that "commercial development" (which is centered around intellectual property and copyright) is progressing faster than open source. In other words it's a kinda A/B test and copyrighted software is progressing faster.
From that point of view it's then hard to be convincing that adding another open-source operating system to the mix (one which has by this point failed commercially) would somehow improve development (as a whole).
(I'm referencing the original assertion in this thread; "Just another proof that copyright laws must be heavily reformed asap because they continue to harm development ")
Now clearly Linux has become a player in the server space. And the BSD's have some small market share. Would the addition of BeOS dilute those already megre resources? Can one, hand on heart, look at open-source development and say it's developing faster than commercial software? Is Firefox leading development in Browsers or is it Chrome? [1] Is Linux (even today) leading desktop development? Or is it Mac and Windows? Generally speaking, if we look at the "big improvements" over the last 20 years, are they happening in the commercial space or the open-source space?
I'm as big a fan of Open Source as the next guy. But I don't think "copyright harms development". I think Open Source is a superb benefit to humanity. But I don't think of Open Source (generally) as a hot-bed of innovation. The tag line of "xxx is an Open Source clone of yyy" seems more common than the reverse.
Do I think intellectual property law needs reformation? yes. There's a lot which could be improved. But claiming that BeOS is "proof" that copyright is holding us back is, in my opinion, a weak argument for said reformation.
[1] Yeah, I know Chrome is "open source" - but it's resourced by a very commercial company for very commercial reasons.
[2] It's also worth noting that _abandoning_ things like copyright law would affect GPL code as much as commercial code. Making everything into effectively "public domain" allows for GPL code to be shipped in binary form _without_ supplying source code.
And after they lost to NeXT, regarding being acquired, not much else happened in regards to OS development.