As far as volume goes, SUV's is where it's at, I think that's where they have most sales happening right now. So that being the case I guess it makes sense to further strengthen them. Still, those sedans need some work... only one that seems to be doing well is the TLX.
While Acura does well with SUV's and CUV's (some of their best selling), I rather go the Toyota/Lexus route since the off-road capabilities really appeal to me, then of course you have all the luxury and technology to go with it.
I guess it depends on which Toyota and Lexus models you are looking at for comparison. The 2017 MDX starts from $43,950 and there are Toyota/Lexus SUVs and CUVs that are cheaper but you won't be getting the same interior seating or features.
You should be able to take the MDX onto dirt toads too, nothing extreme but it should be able to handle the same terrain as Toyota/Lexus SUV. What makes you dismiss the MDX?
You can, you can take an NSX off road but should you? I have no confidence in taking the MDX off road in the sort of conditions that you see people pushing the Lexus LX into which is quite extreme. Do research on the LX/Land Cruiser and you'll see how capable it is.