As always, it's worth keeping an eye on UK Polling Report. The numbers suggest an interesting story - so far being in coalition with the Lib Dems has been good news for the Tories. Based on current polling support for the Tories has risen post-election to the point where they could win a majority outright. The Lib Dems in turn would probably lose half their seats. And this is without even thinking about regional variations (Lib Dems in the North and Scotland may have an even harder time). Add to that the fact that in terms of Lib Dem voters, supporters and activists the drain away will be from the Left. That will leave a party whose Right-wing is further strengthened. I'll leave it to others to speculate whether another group of Liberals will end up in the Tory party.
For the Tories, as someone put it to me the other day, the Lib Dems are simply body armour.