So will one big weaker league work i have done a little research to help you decide.
First of all we say goodbye to the 6 GP riders BK,DB,JD,MF,JH,JK,+ES.
Then i checked which of the riders left double up both leagues and found that all but 15 of them do.
These riders who do not are. J Lidsey, N Blodorn, T Brennan, R Douglas, J Pickering, C Holder, T Musielak, M Zagar, K Rew, N K Iversen, B Cook, M Janowski, R Tungate, L Becker, A Ellis.
I found that of the above riders that 3 of them ride in the Polish top league. 9 of them ride in the Polish 2nd division. 2 of them ride in the Polish 3rd division. Also 8 of them ride in the Swedish top league and 4 of them also ride in the Danish league. So the question is how many of these riders would fancy riding in a league that runs on 6 days of the week of which non of them choose to do now.
Hopefully some do but looking at the possibility that they do not. I have found that 19 riders in the Championship have averages over 7 points these riders are S Masters R Lawson, D King, N klindt, C Harris, C Wright, P Kildermand, S Worrall, K Howarth, E Riss, Z Cook, D Kemp, J Sedgman, D Thompson, J Allen, T Batchelor, A Rowe, A Vuolas and L Flint. So 15 of these riders spread over 15 teams will be the new number 1s. So the big hope is that some of the riders from other leagues will want to come over to ride. But looking how hard it is now to replace any injured riders it would seem that not many would So how do we fill the teams. As has been suggested we can lower team numbers if it is lowered to six then we need 90 riders. If my maths are right we are 27 riders short which will have to come from the National league there are 6 teams in that league which is 42 riders 9 of the better riders in this league already ride for championship teams which leaves 33 so that means a lot of very young inexperienced riders will be in all teams There is also the N D T league but most of the teams are filled with N D L riders doubling up so cuts down the choice of younger riders.
Not sure if my maths or working outs are spot on but it gives a good idea of how teams will possibly look if we go one big league.
In my opinion if they do go one big league having the above number one riders as the best in the league and so many very young inexperienced riders is one hell of a big risk.