What would be the point of Sailfish?
Is it supposed to be somehow better than Android in some way, some way that Android can't match for some reason? Cheaper due to reduced hardware requirements, perhaps? Will native Sailfish apps be able to do things that Android apps cannot and will not be able to match?
There has to be some reason for people to choose a Sailfish device, and some reason for developers to develop Sailfish apps, otherwise the whole exercise seems rather pointless.
At least the FirefoxOS project has some goals in mind (targeting lower hardware requirements to be able to hit that very low segment still dominated by feature phones which Android cannot reach) Tizen has the advantage of having Samsung behind it, and thus could guarantee millions of sales in months if Samsung decided to get serious about pushing them.