Unfortunately, I suspect that the alternative case is that all parties will be aware that due to the fragile nature that any possible coalition might have, or because we end up with a minority government, the next general election won't be any more than 24 months away, so NOBODY will be willing to make any unfavourable tax changes - they will all start positioning themselves for the next election.
As a result, the necessary economic changes that are required (eg. cost cutting, tax increases, etc.) won't happen, and the economy will be even more screwed than it is now.
That's the real danger, IMO.