I think they need to hit some kind of critical mass and get the ball rolling and give developers a god damn incentive to actually develop.
In general I agree with you, but you need to consider that alternative means not something different, but something instead. And if whataspp, facebook is standard in mobile, it would not matter how it's right or wrong or if it should be like that, but that Jolla doesn't really provide that option.
Mobile era is not something new and most standards, apps and functionality are already defined. I'm not saying that it can be changed, but I'm saying that it can't be ignored.
In the begining I wanted Jolla to succeed and I was in first wave, but they proved me wrong. And as I do not care if they succeed or not ....
So what would be the reason for Jolla except "it's not android or iOS" as it's not the argument.
"I marry you because you are not X or Y, as they are shitty people, that's why I choose you"