Which 3 Sydney clubs do you imagine will be axed? It is not going to happen. Expansion in the areas you have identified has to happen on top of 9 Sydney clubs.
To be honest, it doesn't matter to me which 3.
I have no preference, and it gazing into a crystal ball to predict is difficult.. I've speculated on scenarios elsewhere, but there's many moving parts right now.. and the wash-up from stadium redevelopment will be interesting - many clubs will be nomads for a few seasons, and some outlier clubs will feel the pinch for not being based in top-notch venues.
Anyway, if I suggested clubs, there'd be a pile of comments picking holes in it. The key point is that Sydney is over-saturated as it is.
There's many scenarios on how to address that.
If the restructure includes a re-draw of lower grade boundaries, there's no reason why all parts of Sydney can't still be represented in some form.
If it includes teams relocating, we can still have the same brands in the top tier, and they would still play in Sydney a few times per year for traditional fans.
If it includes clubs being demoted to NSW Cup, the identity AND location is preserved in a Sydney competition.
[Edit] it just needs some guts from the NRL to say "We need to do this to take the game forward. Stagnation is not an option anymore.", and stop being afraid of stepping on a few toes.