We all have our salaries of signature campaigns in satoshis already

In the long run, this has been an efficient and profitable payment method. Nothing to complain about it
True and true.
For the most people that have been opportune to work in a signature campaign and have had to be curious on this likely possibility of a distant future: signature campaigns remains your first hand case study. Take it for the Beta phase of what is to be expected and frankly, it wouldn’t make a lot of difference in the end as, most individuals would end up exchanging them for fiat or spending it directly. Same way you use your salaries today just that, spending would come with some level of reluctance.