it seems like no one has yet answered this question.
from a performance perspective... weight distribution is absolutely critical. most people believe that a 50/50 distribution is ideal... but that is not true. 50/50 is ideal in only one situation... and that is mid-corner. at every other point it is sub optimal. a REAR-ward weight bias is advantageous for a couple of reasons:
1. it brings the center of mass closer to the center of rotation... which greatly reduces the polar moment of inertia. this makes the car more nimble.
2. i am sure you are aware that during braking, a lot of weight shift to the front wheels... which results in the rear wheels not adding much to your braking force. a rear weight bias helps to keep significant weight on the rear wheels which results in better braking performance.
3. accelerating out of a corner... once again... the additional weight over the rear wheels give better traction, allowing better power delivery.
yes, there are cars that are NOT mid-engined that can outperform mid-engine cars... but that is because they use other things (drivetrain, HP, etc) to compensate for their inferior (from a performance perspective) platform. the fact of the matter is that if everything else is roughly equal (HP, overall weight, etc) a mid-engine car will handle better than other platforms.
so does this mean that the next honda supercar MUST be mid-engined?
not necessarily. regardless of whether we think they should or not... i dont think honda is trying to built the BEST performing car in the world. we have to recognize that the NSX, as highly acclaimed as it was, ultimately did not make honda a lot of money. sure... honda is not trying to make civic/accord level sales with their flagship car... but it would be nice (from the company's perspective) to have a car that is able to sell better.
so perhaps from that perspective, their design changes make sense. there are practical drawbacks to a MR layout... reduced cabin and trunk/storage space. it certainly appears that honda is taking this car the GT route (ala 599/612/etc) but it is very likely still going to be a serious performer because it will (hopefully) make up for the sub-optimal platform with... something!
will the lifelong NSX brethren/fans be happy about it? some will some wont.
will the car pick up new fans/buyers? i sure as hell hope so