I would definately give consideration to a brand new party if I thought it matched my ideaology.
Well, of course and so would I and so have many people in the past.
That is why there are changes in government because people change their allegiance, think the party they voted for have gone too far and lurched more to the right or left, or have read the manifestos before voting, seen a fresh approach and approved of what they read.
I don't believe it is because, in the main, people vote tactically.
The French system of voting is different to ours and obviously that is what people will do. They now have a chance to look and choose again out of the two remaining candidates.