I know it's only polls, but; the current polls suggest that even a CON/UKIP/LIB/DUP coalition wouldn't have the seats required to govern. Also, UKIP have ruled out coalition (I'll believe that when I see it). It's reassuring that UKIP are only projected to get 4 seats.
UKIP will jump at a coalition with the Tories. That isn't the issue - the reason it won't happen is because the Tories won't do it, for good reason.
UKIP only have a chance at propping up a minority government if they agree to a referendum on Europe. Again, the Tories won't take that.
They don't know it yet, but they had no chance of doing anything from the moment they were formed with the closet racism agenda. No mainstream party will touch them.