I honestly don't think there is as big a discrepancy between division one runs and division two runs as people (and the ECB) make out. Bowlers such as Matt Henry, Tim Murtagh, Jofra Archer, Mohammad Abbas, Chris Rushworth, Ishant Sharma are all about at a ''division one'' level (or higher in the case of the test bowlers). Zak Chappell, Ben Raine and Ryan Sidebottom (the Anglo-Aussie Warks one) seem to be at that level also. Wood, Woakes and Stokes also (whenever available). There will always be two teams who by default were formally in division one - one of them won the entire championship two seasons' ago! The success of Essex in 2017, and to a lesser extent Notts this season, demonstrate that the gap is not so wide, and that it is quite possible to get promoted and not simply yo-yo back but go on to the pinnacle (in Essex's case).
The gap between division 1 and (currently) your Kents, Essexes, Sussexes - only one of which will get promoted alongside Warks - is not so big.