Agree with buzz, this won't work and will simply cause the poorer teams to decline further and the rich to get richer. Unfortunatly test cricket is dead, standards are already low and so,e mediocre players are posting stats alongside pontings/kallis's when they aren't a patch on them.
Decision time really, you either keep 2020 and sack off odi's and keep,tests ..
Sack of tests and keep all white ball
We can see the results of players playing different formats and it proves you can't expect so,some to be able to go from 2020 to test cricket (assuming you don't play it always on roads). There is too much cricket and somethings had to give. Just playing less of each does t solve the issue about standards as that player is still playing with a mixed technique (think butter, hales, Ali, Roy, burns) rather than one suited to tests. If we go for 2020 and tests then you can separate out the disciplines and players can specialise quickly and both formats can be paid enough to make them both attractive