I love Fantastical on the iPhone, and I've had v1 on my Mac since the beginning.
I think they've overlooked a potential sales revenue in v2.
As apps go v2 is expensive, although I don't begrudge them charging what they are. However I rarely use a fully fledged calender app on my Mac, the menubar approach of v1 has been fine.
I think they should offer a menu bar only version, updated to the new v2 style.
That way, people like me could pay for a new updated ui, without the need to spend out for a fully fledged calender that I won't use. Now I'm stuck with the very out of place looking v1 (on Yosemite at least)