first attested to GBS:

[f. blend of the name of Victorien Sardou (1831-1908), French dramatist + DOODLE n. + -DOM.]

A fanciful word used to describe well-wrought, but trivial or morally objectionable, plays considered collectively; the characteristic milieu in which such work is admired.

1895 G. B. SHAW in Sat. Rev. 1 June 725/2 (heading) Sardoodledom. 1897 in Ibid. 17 Apr. 410/2 It is rather a nice point whether Miss Ellen Terry should be forgiven for sailing the Lyceum ship into the shallows of Sardoodledom for the sake of Madame Sans-Gêne.
[©OED2]

(-dom = abstract suffix of state)