Per yours and Lolita's postulations that Cyril soldiered on because he cared deeply about his craft, I've found one item which may support that: in 1921, Cyril's among a handful of younger actors who create an after-hours review to entertain the theatrical community. Seems to be a rather innovative project, and it's under the aegis of several heavy-hitting guilds/clubs; Lambs, Friars.
Cyril's face-time from all those films can't add up to more than 3 hours altogether, maybe less. From this distance, it does seem terribly futile as the work of a lifetime, but, in the end, impossible to know how Cyril saw it.
Cyril's last film part was in 1951, and that's the same year he came into a good inheritance. I did find that he was manager of a very good Hollywood restaurant in the late 1950s - huge bar, established regular hangout for famous movie folk - but I've no idea if he'd been doing that when still working in movies.