With the appearance of the different cryptocurrency technologies, micro-payment services have become possible. So basically the next evolutionary step can already be predicted: cloud-micro services with the direct micro-payment possibility. There are some initiative for creating such an architecture for Bitcoin, like, https://21.co/, however I think the idea gets much more exciting if it changed to Ethereum. At Ethereum there is basically an amount of 'money' or gas that is payed for all of the execution that are validated by the Blockchain. It is not difficult to imagine an extended model where each execution independently if it is an internal call or a an external micro service cost a certain amount of 'money'. In this sense providing a backend service will be realized as a complex micro service integration task with complex financial impacts.