There can be dual-purpose for touge courses because think about it- Japanese drifting fans get what they want, and they can also serve as great tarmac rally stages. I want to think of touge courses as rally courses and here's why. The courses have that rally feel to them. NO illegal street racing. We can make the courses professional. Block off the roads with police cars and concrete barriers, then it's just racing just as you like it. I see dual purpose and just reinforcing what I've stated earlier.
I think of drifting as rallying. Maybe I'm the only one who thinks like that. I think drifting is like rally racing, only that you're not up against time or in off-road conditions. Drifting and rallying have a few likenesses- opposite lock and sliding into the turns. Both of which need good skill to master the field of racing. You may not see the two as bearing some likeness, but I do, oddly.