In the long run, as has been pointed out, the rise of a lot of graphic software packages at this particular juncture has everything to do Adobe's current subscription model. Like many designers, I'm still forced to use Adobe at work because it is being advocated as "the industry standard."
At home, however, I've spent the last year looking for alternatives to InDesign and Illustrator. Ironically, the best two that were found were QuarkXPress (expensive, but had most of the features to equal what was being done in InDesign) and PagePlus, which was the one chosen (granted, it has to be either in a dual boot or in a virtual windows environment, but it does the job).
The problem when the Affinity Suite--most notably Affinity Publisher--finally comes to market is going to be getting commercial print shops to take their native files. Most shops work with hi-res PDFs now anyway, but for that 5-10% of jobs that need to be corrected within the native file(s), the shops are going to need to be able to open the file format. Currently, most professional print shops (in the states) take InDesign, Illustrator, Photoshop, PDF, QuarkXpress, and sometimes Freehand, Microsoft Publisher and CorelDraw files.
I submit two thoughts:
1) Affinity will need to allow Publisher to import and/or export .idml files so that previous users of InDesign can use their files in Publisher (the open-source program, Scribus, claims to have achieved .idml import currently in version 1.5 which is a developmental build) and export to an interim native file format that the commercial printing world can work with.
2) Affinity will need to go on a massive marketing campaign targeting printing vendors and extolling the virtues of adding Publisher to their armory of tools.
Having said all that--and currently being a PagePlus and DrawPlus customer as well as a proponent of the Designer beta--I can't wait until Affinity kicks Adobe's a$$.
By the way, as a Sketch user, Bohemian Coding's app seems to have been made to compete directly with Fireworks. Although it does work in vector, Sketch does not have the chops to fully compete with Illustrator (which is the territory that Designer fully stands in now). The only app that could have made that claim on OS X is/was Freehand (as DrawPlus, CorelDraw, Canvas, and Xara are all currently Windows-only).