Agree on that - the B4's still flying and winning most events out there, the Losi XXX hasn't "really" changed much since 1999 when it came out - just refinements like geometry changes etc, the basic chassis & layout is the same.
It's hard to see any massive improvement or big change to be honest as these mid motor designs obviously aren't a step forward, just an alternative.
I think the days of major changes are gone, the change from RC10 to RC10 B2 was massive and it won comfortably first time out.
Nowadays it seems to be more about refinement then big revolutionary changes (in 2wd at least)!
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