I Don't even see qhere's the problem. Truespace wahsn't really a good tool. When it was free yeah maybe for studenst and such but I never heard some team in cg industry unsing it.

Just by checking a job board you'll never see an truespace modeler/ animator position which is essential for a tool.

Professionnal are the core of the tool market and Truespace si so far away from maya or 3ds Max. Compare it to latest houdini for example or modo and in term of price or workflow and it's over.

It's a sad thing for indies because it was free but I won't cry over it. I own my version of maya and I'm really happy with it and I4m pretty sure if I ask any person of my team if they ever use truespace, the answer will be no.