Japanese 2T enduro bikes. The prices that even average YZ250WRs and WR250Zs go for shows that there's still enthusiasm for them.
The modern trail bike market is very "hardcore" compared to where it was for the previous 35 or 40 years. In the past, the mainstay were bikes like DTs, TSes, XTs, XLs, and then XRs and TTs.
Nowdays, bikes like TTRs (which are vastly superior to the older TT250) are looked down upon as "learner bikes"...
Go figure.
The maintenance requirements and road suitability of a modern performance 4T is akin to that of an old KDX or IT. But where the old ITs were mostly only bought by relatively dedicated,experienced riders, a current WRF450 is the generic "trailbike" in the same way an XR250 was twenty years ago.
I don't imagine that human evolution has moved that quickly in the last twenty years, but apparently our need for shiny things has...