Here we go again.
I want no stinkin' adapters. Two way compatibility is the only path that makes sense.
Launching a new system in an attempt to imitate others does not guarantee success. "I want a Sony Nex-5n/OM-G, erm, OM-D, only from Pentax" can't work.
Starting from scratch, with zero customers - what a brilliant idea! Not. Customers won't go berserk buying into the new system; instead, most loyal ones would be lost (breaking the compatibility hurts them the most)
A new system means way less resources for the K-mount. Which of the lenses
from this roadmap do you consider unnecessary?
There is also a psychological factor: people would scream: "OMG, Pentax is phasing out the K-mount! Don't buy, until we see this is not the case". This would be artificially maintained mostly by people who are anything but Pentaxians.
A new system is not needed, period.