Hi Nicolas,
It's a very good idea to have spamming as a service and if this successed will have better vision about situation around block size and costs.
I'm going to support this, hopefully you will receive support from others to make spamming continually for two days.
To be clear, my intention is to make it long lasting, not a simple 2 days, the economical repercussion on the middle/long term can't be felt in 2 days.
The spammer would be able to decide how much to spend and the timespan to spam.
I will make big transactions with the estimated fees for 3 blocks confirmations.