Is the time bubble around Gallifrey meant to resemble the envelope of Slo-Time around Krikket? I know Douglas Adams made Slartibartfast after the Doctor, and although the episodes with the time bubble are after Douglas' time, is this a nod towards him?
The Gallifreyans could have been written off as dead or lost or...anything really in the new series. But they are trapped in a time-bubble much like the Krikkets.
Coincidence?
Obviously there are no cite-able sources for this, But given Douglas Adams' penchant for poking fun at as many things as he would within the pages, your hypothesis makes sense for Krikkit being an analogue for Gallifrey.
Also, given Russel T. Davies' longstanding involvement in the Sci-Fi community the irony of nodding back to Adams' work in such a way seems rather.... fitting.
As Gallifrey isn't actually trapped in a bubble of slow time I don't think there's a connection like you suggest. The war is in a "time lock" and Galifrey is in a pocket universe.
However, there are connections between Galifrey and Krikket. As detailed in Did the Doctor inspire Slartibartfast?, Adams wrote Doctor Who and the Krikketmen, which ended up being adapted into Doctor Who's sixteenth season (The Key to Time) and of course Life the Universe and Everything. Krikket was never equated with Galifrey. Instead I believe it was the Time Lords who imprisoned Krikket.
Adams was also the script editor for season seventeen, and wrote Shada which was adapted into Dirk Gentley's Holistic Detective Agency.
