9 are computing devices and peripherals: 3 laptops, 2 tablets, 2 phones, 1 wifi inkjet printer and 1 wifi laser printer.
6 are entertainment devices: 1 smart TV, 3 gaming consoles, 2 media players.
21 are home automation devices: 1 wifi-zwave-zigbee-leviton-lutron hub, 1 connected deadbolt lock, 2 connected garage door openers, 4 old Android phones that serve as IP security cameras, 5 connected smart bulbs, 4 connected power outlets, 1 connected thermostat, 1 Amazon Echo and 1 "plug PC" that runs a home automation server and backups.
I have to run 3 routers to keep everything covered, and everything that can speak 5GHz instead of 2.4GHz does so just to keep the airwaves a bit less crowded. The network is a mess.
DirecTV receiver & slave, Roku, Amazon FireTV Stick, 3 laptops, a personal server, 2 Android tablets, an iPhone, an Android smartphone, a kindle e-reader, a VOIP box, a networked printer, sometimes another work laptop.
This is only a list of items that have been connected to my home router within the past 7 days, so these items are all currently in use.
Approx. 3 years ago, I had 4 devices: 2 phones, 2 laptops.
Added thermostat, smoke detectors, and 3 game consoles in the past couple of years.
Five years ago that would have been 3 laptops, 1 computer, 1 WII and little else.
Next five years will see many more devices but not in the same class of product as any of the devices currently in the home.
It has increased in the past 5 years considerably from about 3-4 before.
In the next 5 years or so I would expect that number to jump again, maybe 2-3x.
About 5.5 years ago I was only at 1 laptop, so it's increased fairly significantly since then. If I move into a larger space, my # of hue lights (or similar) is likely to increase some.
3 macbooks
1 chromebook
3 smartphones
1 roku
1 XB1
1 NAS
1 DirecTV box
1 IP printer
1 smartwatch
1 iPad
1 Sphero
2 Chromecast
So in total, 17. That's being a bit liberal with the Sphero and chromecasts, since they don't actually have internet access.
1 to 2 years out: home automation hub dropcams fridge thermostat TVs everyone having their own phone, tablet, laptop, watch, fitbit cars multiple printers 3D printer
== 15 and I think I've missed something off, can't remember.