163.5M is still a significant number of sales per year though. I don't think it's a dying segment yet. Interestingly detachable tablet sales have increased for the past few years.

Source: https://www.idc.com/getdoc.jsp?containerId=prUS43549518

Is it because of the lack of interest or is it because people aren't replacing them because they are still working for them? I haven't lost interest in tablets but I also haven't bought one in four years because mine suits my needs.

It’s more like cell phones have created unreasonable expectations for sales. People change phones once ever 12-24 months. Tablets, on the other hand, easily last 3-4 years. In that sense, tables have more in common with laptops than phones. People who need them, buy them all the time. It is just that not as many people need tablets as phones. Initially a lot of tables were sold because of the hype. But then people realised that not everyone needs a tablets — and theat tablets can be shared among the family — unlike phones. Hence the so called “decline”.

I like to think that tablet sales are reaching their stable values rahpther than just declining.

iPad sales peaked a few years ago, but they still represent a good chunk of Apple’s revenue.

https://www.statista.com/statistics/269915/global-apple-ipad...

https://www.macrumors.com/2018/05/01/2q-2018-results/