Ehm, FPGA/CPLD are everywhere, it's hard to say, but my educated guess is that hardware market consumes similar amount of SoC-like and FPGA/CPLD chips, look, even Pebble smartwatch uses Lattice iCE40 FPGA, MacBooks also usually have few FPGA's here and there. FPGA/CPLD's are essential to implement "glue-logic", which does what it says - glue different pieces of hardware together. Of course you can do "glue" in software, but than your customers will enjoy poor battery life time and random glitches here and there. And nobody gonna spend big-money (it's actually depends, sometimes it 1kk+$, sometimes you can get away by 30-50k$) by running their own ASIC's when you can just buy jellybean FPGA's.

Indeed phone/desktop market might move to more one-chip-for-everything solution, but even then we need glue-ish logic to control something like screen backlight DC-DC converters, charging IC's, etc, which is much more easier done from FPGA/CPLD-like devices. On the other hand FPGA/CPLD's are essential in some classes of devices, for example test instruments: modern oscilloscopes usually have 3+ FPGA's in them, companies like Keysight usually only run custom ASIC's when they hit limitation of current silicon tech, like their N2802A 25GHz active probe (starting from 23500$) uses amplifier IC made with indium phosphide process (InP), which is kinda far away from whatever current consumer product companies are doing, you can check the teardown of this beast here https://www.youtube.com/watch?v=jnFZR7UsIPE

So in my opinion FPGA/CPLD market will live long and strong, players might change, but demand is enormous. The only problem in my opinion is that whole market is more B2B-like (FPGA's are usually just a humble IC's inside end customers products, you don't see stickers "Altera inside" or anything on products themselves), so it's kinda hard to get grasp what's going on.