JA
Most of them were already gone anyway. Yorkshire's and Granada's were the only ones left from even the 1980s (both debuted in 1968). Granada's wouldn't have lasted much longer, they were planning on updating it but abandoned it for the hearts idents.
I personally thought the Central cake and Anglia flag were also design classics. The Meridian logo, less so, but rather interesting regardless. As far as I know, there were no concrete plans to replace the Granada arrow. I've seen some ideas they had but little evidence they were more than that.
Central's cake was already gone even before the 1999 generic idents came in though, therefore it's among those that I said were already gone. Anglia I'll admit I forgot about. The A flag, of course, debuted in 1988.
As for Granada, this is what they were planning to replace the familiar G-arrow with:
http://thetvroom.com/images/pool-ex/ex-032/main-001-02.jpg
I think one lamentable thing that came out of the destruction of regional ITV, that most people can surely agree on, was the disappearance of several classic TV logos.
I personally thought the Central cake and Anglia flag were also design classics. The Meridian logo, less so, but rather interesting regardless. As far as I know, there were no concrete plans to replace the Granada arrow. I've seen some ideas they had but little evidence they were more than that.
As for Granada, this is what they were planning to replace the familiar G-arrow with:
http://thetvroom.com/images/pool-ex/ex-032/main-001-02.jpg