I do no think it is a good idea. All ready players are very busy nowdays, you cannot ask more from them. Cricket has become business to mint money. Let them rest for few months before these guys start again.
How will you enjoy a game or a tournament with tired players?
If you can time the tournaments perfectly then it will be entertaining, the leagues will conduct their matches during the first part of the year and the Champions league will be conducted at the later part of the year which will enforce interest in the view public to know which team is the best among all the franchise teams and it might have a huge response, timing is everything as you cannot force these tournaments one after other, if the cricket boards are able to time these perfectly then they will succeed.