Windows Phone was version 7 and it didn't seem to make a difference. It's pretty safe to say that at this point, you need to make a splash or you're going to end up an afterthought. You can't just stumble in, you need to offer something compelling enough to convince others to get on board. Slow, evolutionary growth is fine for some things. It's not OK for a mobile OS launching in the year 2013.
Call it bullying the new kid all you want to rally support, we're just being realistic. When the vast majority of mobile phone users really couldn't care less about how "open" their phone OS is, FFOS brings little to the table except catering to amateur developers. Considering what is holding back OSes like Windows Phone isn't lack of apps from amateur developers, quite the opposite. They have those, but lack the heavy hitters.
I haven't heard "No thriving development environment for small developers" once when covering the downsides of Windows Phone. I have heard "No Instagram" about a thousand times. Maybe it's just me but I don't really remember an instance of any OS becoming popular by catering to small devs. It's a part, but it usually comes AFTER enticing users to come aboard. People didn't develop for iOS because Apple made it painfully easy for them, they developed for iPhone because millions of users bought them, said "Isn't this so cool, but I wonder if it could do <blank>?" and the rest is history.
Likewise, developers weren't chomping at the bit to go messing about in Eclipse, but millions and tens of millions of Android phones ended up in users hands. Suddenly, there was a market and then the popular apps came.