Is it possible for NatAmi to go any slower without going backwards? 

yes of course.
But don't think it will go as far as going backwards. That would mean that they remove things they have already done on the MX.
Actualy it did take some steps back when jumping from the LX to the MX version.
Be patient or not. But ppl need to stop taking anything Amiga related to serious.
The Natami, FPGA Arcade, Minimig, X1000, MOS, AROS won't become what Amiga was before.