Definitely more scope for making the game more exciting, and easier to understand.
I also think that the money is not there to support two professional leagues, but I'd add a 'yet' to that statement.
If you assume there will be a Wasps and Worcester in the Championship next year, plus say a relegated London Irish to get to the 10 team prem, then that instantly makes the Championship more competitive and attractive. Especially if you also consider there are other competitive teams, Ealing, Jersey, etc.
To support and nurture this, the championship needs more visibility, better profile, maybe free to air live games even if just online. But overall more publicity and profile - I'm not a media expert.
Also, further limit premiership salary caps (don't increase them), remove barriers to promotion, make it a sporting meritocracy and not based on whether you could hypothetically get 10,000 fans, etc, and go for a two up two down promotion/relegation system, and over time, say 5-10 years, the money and players trickle down, interest in the championship grows, and the gap closes.
This is speculation, but if you don't try you will never know. And at the moment, the game is shrinking.
If the money clubs insist on chasing bigger budgets and more glamour and share of the prize then the above will never happen. It's in this that we need a strong RFU, to actually lower budgets and make the competition more equitable, for the longer term health of the game.