not sure that future nitro engine productions, all around the world, would be high quantity batches...
today, loooking and understanding new modelers -->time is clearly for brushless power! so easy for young consumers
on a marketing point of view, nitro engine will concern, step by step, only a short group of experienced & expert modelers, also older every new year - so they will quit progressively this hobby technology
that's a fact
golden years of nitro engine were the years of picco/ops/cmb/novarossi
initial designers; two of them have passed away now
to me, looking at .21 size engines for instance,
nothing significant have reallly be designed after ops.21 sla & re design (1975?)
Gualtiero Picco was the best microengine designer, and his work matched nicely with the eighties technology and culture
today things are so different, but that's life!