Can't really know, but I am thinking they don't want progress under the Wests Tigers banner. This is the first year in 10 years that they recorded a profit without cash from HBG. Richo was open about wanting to run with financial independence from HBG, and maybe they were starting to see their power slipping.
I think HBG probably do need to move on. Their vision for the club seems to fundamentally oppose the vision of the Wests Tigers supporters, the NRL and supporters of the game in general. Which makes you think, why would they bother? One strong motive would be to stop progress of WT because they really want the magpies to live on/take over.
I'm a tigers fan from 1988 - I couldn't care less whether we play out of Leichhardt, Campbeltown, Parramatta or Pittsburgh for that matter.
I also have some experience in business and know that it's harder to screw up like HBG have than it is to make it a success, which makes me think they must be doing it deliberately.