The problem with kicking these teams out of the league is that it would be detrimental to the other teams too, that's why I think giving them a massive points deduction instead would be best. The other teams will still play with them and reap the benefits, but the big 6 won't have a chance of winning anymore.
Ahh yes that sporting integrity everyone is looking for.
If you do something that extreme then the chances of coming back from all this is slim to none. The only clubs that will suffer are the 14 clubs who vote for it absolutely killing their finances.