Well it's really difficult to answer this question, it really depends by you.
Personally, I would go crazy with so many devices, I'm definitely the one that prefers a minimalistic approach. But this is just me, based on my job, usage patterns, etc. I'm working on some personal projects along with my job, so I need a laptop that it's just to cumbersome to be used while I commute 1.30 hours a day, so in this scenario the 6s plus fits perfectly. And again I have an iPad Air that I'm not using anymore 'cause of the 6s plus.
If I wouldn't need a laptop to work on my business and projects, I'll definitely go for an iPhone 7 and iPad Pro, it's the perfect "consuming media" combo for me with extreme portability, especially now that the iP7 camera has OIS... one of the main reasons why I've chosen the plus version 2 years ago, even if the big size really bothers me especially when I put it in my pockets.
But again, that's me, I think none can predict if you'll lose interest... lots of people that switched to the 7 plus reported to have used their ipad much less tho.