I'm a little weary of this "artificially imposed studio deadline" talk. TMP had a YEAR of post production, which is usually plenty, and that would have been longer had principle photography not run over schedule. The film got in trouble over the ASTRA issue, and the producer's apparent unwillingness to trim down the number of effects shots.
Too bad the delays didn't push back release to a later date, like how how Star Wars was pushed from Christmas to the following Summer. There is something called putting out the best product!