I don't think so entirely. The reason why you would want to keep the subscription, especially the Master tier is to share the digital books you have and to also have unlimited character sheets. Though I do not trust they will support everything on there forever.

This is why my group used the subscription - a group of players chip in to 'buy' one digital copy of the book we need to use, and then split the cost of the subscription during the campaign so everyone in the group can use that book with the digital tools.