Rouvoet (CU) has the most intersting position this time, especially failing SP negotiations. Now let us see how sincere he truly is with power at his grasp (because he's perhaps one of the the most sincere politicians we have).
I'm still hoping on a SP-CDA-PvdA coalition, but I agree with your analysis of the of CDA & PvdA preferences. Your predicted formation time: not so sure, with another upcoming election at hand?? But it may take so long, if people get stubborn...
For example, there has always been a number of local parties that don't even exist at the national level, and can't make the jump to the national level very well (like the "Leefbaar" parties).
Local elections are a different kind of game, more different kinds of coalitions are possible, issues are easier.