The problem you have is that it will take a massive amount of effort, support and leadership to move on from this position - under the club's current format you possess none of these.
The club needs to stop dealing in idiotic short cuts - change the name, don't play at a Union ground being the most insane of all the decisions, based on not a single scrap of data that I could see.
Lobby hasn't been on here for a while - I seem to recall that was his recipe for success. Worked well didn't it? The support base decimated by 75% in a single ground move.
Time to lose M62 thinking and realise you're operating in the London entertainment market. Therefore, the rugby or the standard of it is irrelevant to be honest. A properly marketed 'fightback' that people can buy into supported by a matchday experience that is fun and enjoyable off the pitch - will have people returning. Hopefully the rugby will improve and together these things can slowly rebuild the fanbase.
I'd get away from The Hive as I don't think any of that is possible there. The Stoop was a great location and venue but may be too expensive now. But I feel you have to move back to West London - you still have a fanbase there based on previous attendance figures even from last season. Somewhere like Esher may not be a bad call if you could guarantee it for 5 years and they're interested. If you get promoted before then - nice problem to have. (Not exactly West London I know btw!)
Keep the youth going - as much as anything for the revenue from selling players. Nothing wrong with this if it's part of your business model until the club gets on to a more solid / successful footing.
I'm singing to the choir here I know and there's no magic answer as the previous poster said. The biggest issue is lack of leadership of the club. With no leader then I don't see anyway back which is really sad as although I've never been a regular - I've always had a great time at the games at The Stoop / Griffin Park and it's sad to see all that lost in such a short time by criminally poor management.