The problem for the Lib Dems is ...

The problem for the Lib Dems is that they just don't have that much support.

The truth is they borrow a lot of support. ( All that tactical voting - winning here stuff ).

Hence in government the votes they have borrowed from the now opposition have all moved to that opposition, but where they stand against Conservatives things have stood up - for now.

The Armageddon scenario for the yellow ones is if Labour become nationally credible, especially in the South. At that point their position, kept by borrowing Labour votes in the south, may collapse.

I think the commitment of Lib Dem activists to their hobby of getting elected is far too strong to let this happen. Hence I predict Nick Clegg and the Coalition are doomed.