Entirely my personal opinion...

I personally feel that most toys made after G2 stand to benefit far less from being remade as CHUG or MP toys compared to G1 and most G2 figures. And of course the main reason for this is that Beast Wars gave us the Transformers toy Renaissance which has set the standard for which Transformers toys have been made ever since.

When I look at CHUG and MP toys based on post-G2 figures, I find that very few of them are substantially superior to their original counterparts, especially factoring in things like size and price. e.g.
* Rhinox = considering that we're looking at a Deluxe vs. Voyager (i.e. double the price), the Generations toy is, in relative terms, on par with the original IMO. Both are great toys in their own right.
* Waspinator = this is a really easy comparison because both the original and Generations figures are Deluxes, and IMO they're both on par with each other. I don't find either figure to be significantly better or worse than the other.
* Tankor (fat) = actually in relative terms, I find the Generations figure to be inferior to the original BM Mega figure. While more show-like, the original figure offered loads more fun and play value as a toy. I'd rate the Generations figure as being on par with the BM Basic Tank Drone.
* Rattrap = We're comparing a Basic with a Deluxe, and again I find both figures to be on par with each other. Sure, the Generations figure offers a lot more, but it also has a fiddly transformation and the Basic is a really good One Step Changer. Compare the original Rattrap with any One Step Changer today -- they sure don't make 'em like they used to! I find both to be great toys in their own right.
* Cheetor = here we're looking at two Deluxes and an MP. Here I find Universe Cheetor to be hands down inferior to the original. The problem with the CHUG figure is that it blends elements from Beast Wars and Beast Machines and it suffers from the elements drawn from BM Cheetor. The MP toy is nice (although those whiskers look like they'd be prone to snapping), but when factoring relative price point I find that both the original and MP are equally deserving figures.
* Optimus Primal (gorilla) = comparing the original Ultra Class with the MP - both are just excellent toys. Really fantastic. But in relative terms I don't find either to be better or worse than the other. MP Beast Convoy was the first and last BW MP toy that I bought.

And looking at pics of MP Dinobot, yeah, it looks really fantastic. But look at its price point compared to the original being just a Deluxe Class figure. I don't think that the MP figure offers much more than the original when we factor in price difference. If you want a better Dinobot then you're better off getting the Universe or Henkei version. That mould does a top job in creating a more show-like Dinobot within the confines of a Deluxe size/budget. But hey, if you want high class slavish show accuracy and you don't mind shelling out the bucks, then MP Dinobot is great in that regard.

And I would feel the same as you if they ever did Car Robot/RiD as CHUG/MP... I probably wouldn't buy them. Maybe a CHUG Super Fire Convoy. But most of the others are just fine the way they are. I wouldn't mind affordable reissues.

The main exception I would make would be ARMADA. Because a lot of the original Armada toys were just badly designed, even for its time. Remember that Armada was the immediate follow up to Car Robot/RiD. Armada toys were so poorly made that it gave rise to the fan phrase to describe toys that were compromised by its gimmick - "WhY My ShOuLd3R5 hUrT?" and the whole "JaAM!" thing. Even Hasbro poked fun at this when they made CHUG Hot Shot and gave him the number plate that said "JAAM." Universe Hot Shot is a much better toy that Armada Hot Shot, and Combiner Wars Armada Megatron is definitely better than the original. I personally wouldn't collect CHUG/MP Armada figures just because as a child of the 80s Armada doesn't hold childhood nostalgia for me, but I do think that Armada (and also Energon) is a line that would benefit more from a CHUG/MP treatment.