If everyone started sending marketing emails like this, then they would start looking like advertisements, they would feel less personal, spam and "promotional" filters would adapt, and you'd be back to square 1.
Plus, I very much like the "Promotional" filters for email, both as someone that receives it, and someone that has sent it.
Email spam is annoying because it's in your way, it interrupts your day, and almost "forces" you to pay attention to it, which is annoying.
The "promotional" tab in gmail (or the similar group in Inbox) fixed that problem for me. Now I go and look through it when I want, and I not only read more of them, but i've done more "action" from them (rather than get annoyed at spam, i've seen that something is on sale, or a new product is released that i was looking forward to).
If there were a way to "mark" my emails to go into that tab voluntarily as a sender, I would do it. The whole idea that you should be fighting against how the user wants to group their email seems backwards. If they don't want to see it, forcing them to see it isn't going to make them like it...