It seems that Capture One Pro doesn't support importing of Lightroom's custom presets?
I'm happy to stick with Lightroom 6 (I have only ever bought standalone) and see where things are in the next major release. I have zero interest in cloud based solutions with limited features just yet. I only edit on my main workstation, and have no reason to need to edit "anywhere".
I also see no reason why anyone would think of moving to something else if their current install is doing its job? Just keep using it until it no longer has the latest features, then look at what your options are.
GPU acceleration in LR6 works really well. Just make sure the option is turned on in settings. It only applies to the develop module of course, but makes editing and moving around images much quicker.
All my i7's cores appear to be utilised when exporting a batch.