Can a rig support 4 parallel paths with 32 FXs blocks currently ? May be or may be not... Don't know.
Even 2 // paths, IMO it can be done but the other question would be to know if the ergonomic is enough good to install it on Head/Rack/Stage. It could be easy on Rig manager but on the hardware itself, i'm not sure.... This could be the reason to launch a K2...
In theory the KPA could get a lot closer to the "4 parallel paths with 32 Fx blocks" than we might think. Kemper just has a different philosophy of DSP allocation than their competitors.
Using the Helix (or perhaps the QC) as my point of comparison, the Helix cannot support its four parallel paths with 32 fx blocks, because you'd run out of DSP long before you fill up that space in a musically useful way. It's 8 x 4 is more about the ability to organize a much humbler combination of effects in a visual appealing way. Further, you're going to need to use much of the whatever potential space there is because there's no spillover and a HUGE audio gap if you switch presets. In order to not lose spillover you have to give up half it's processing cores, limiting you to 8 x 2, which is again only a POTENTIAL 8 x 2 provided you don't run out of DSP.
On the KPA DSP is preserved to allow you to seamlessly switch between Rigs and any combination of effect modules in the performance. If you're content using one advanced parallel delay and reverb algorithm at a moment in time (in the location 90% of guitarists actually use these effects) you have spillover as well. Its limit of 4 effects before and 4 effects after is not the whole story either, as it's it also has input transposition, noise gate, looper, and global output EQs that don't count. It also has more EQ and tone shaping options built into in its amp section than the QC has.
As far as cost of production, I don't doubling the same type of chips would be prohibitively expensive. Maybe there's more complexity to it than that, but consider that the $699 Player is supposedly run by the same chips as the Stage and Head. Or a separate modern processor allocated to providing a visually appealing GUI like the Fender tone master could be used alongside the old chips for the effect and profile processing. Perhaps let the new processor handle something like an advanced preset independent looper, leaving room for a couple more effect slots in a Rig?