It is called prepaid.
The reality is consumers like it. In the US the prepaid segment of cellphones is growing 3x as fast as post-paid (recurring bills). In a couple years the post-paid segment will likely flatline and at some point prepaid will be the majority of plans. Prepaid cellphone plans now cover everything up to and including the top of the line smartphones and 4G computer/hostspot type devices. Sure post-paid with overages, hidden charges, unintended payments, etc are GREAT for the merchant but consumers will go where they find the best value. "Why you no come back? I want to rape you with hidden fees and unwanted payments"
http://www.bitmit.net/en/user/TangibleCryptoAs more products become prepaid more consumers will expect/demand it. There is almost no product/service which can't be prepaid. Someone will open the first prepaid gym. It is only a matter of time. Pay $x for 20 workouts. The smart merchant analyzes his consumer behavior. If you know the average consumer quits before using 30 workouts then you can significantly "discount" the units the consumer will never use.
i.e.
$10 for 1 workout
$50 for 20 workouts
$70 for 50 workouts (w/ a BEST VALUE icon)
Change can be scary but if you are offering a clunky recurring billing payment and your competitors are offering a prepaid card you are going to lose.
At best any workaround could be described as clunky. The fatal flaw will be the lack of universal support. Are you only going to accept payments from customers using wallets that support it? Bitcoin market is already small can you afford to make it smaller?
Bitcoin is revolutionary so it requires some out of the box thinking. There isn't always a direct equivalent but they are alternatives. One idea I just thought of would be to setup your service/site where when the user logs in it informs him of how many days/units he has left. Some smart programming could recommend users personalized "one day only sales" to get them to re-up before the last minute. To continue the gym example, if the user just finished a great workout, that night send him an email offer about discounted price (limited time only of course).