As a CL user I can suggest another perspective to increase adoption of a CL implementation:
improving developer experience. Good slime integration, fast slime (fuzzy) competions,
convenient sldb debugger, with local variables and so on.
Today ABCL is not bad from this perspective: slime competion work (speeding them up will be good though),
slime functions argument hints work, slime-go-to-definition work. But of course there are always room
for improvement. For me as a developer the dev enviroment convinience and development speed
is more important even than execution speed of my code. So, after fixing the important libraries,
you could probably consider development convenience as and area for attention.
Best regards,
- Anton