In a way its already gone to the internet and away from the outside sales rep........at least for stand alone printers and A4 devices. If all someone needs is a printer or an A4 to be used for basic printing,scanning and copying.....face it, they really don't need us already.
If you've been at this a long time you probably remember the days when you sold a lot of A4 machines to small offices. 20 years ago if you needed an A4 you called a copier dealer. Those days are gone for the most part. Staples and others became the source for the desk-side tabletop Brother and HP MFP.
With A3 I think the need for an outside sales rep will remain hopefully for the next 10 years if we are lucky. The logistics of delivering, installing and so forth will make buying these products on-line less favorable for a business.