I also doubt that 1/35 will make a big showing in the automotive circles, but you never know. I don't really see Roden making a 1/24 version of this bus even if the 1/35 bus sells well. There just really isn't that big of a bus modeling community, but the modeling community in general is full of surprises.
Meng also released 1/35 & 1/24 versions of their Ford F350. It would be interesting to see which version of the kit actually sold better.