* Recurring and Scheduled payments. On the first of every month, the alarm service pings my wallet to pay my utility bill.

Most of the other potential applications it's easy to argue that they could set up their own incentives to get some user in the system to execute the call. (lottery payout, scheduled trade, crowdfunding payout, etc).

I think that yes, each of those applications has a viable way of motivating some party to execute the call. However, if a service like Alarm proved to be very reliable, it may be simpler to just automate it with a scheduling service. Scheduled or recurring execution doesn't have to be the only solution to a problem for it to still be a good solution.