That can be migated. Just make a pre-negotiation round, were post vote, those parties who are below n% can give there vote share to the parties who make it over

That can be migated. Just make a pre-negotiation round, were post vote, those parties who are below n% can give there vote share to the parties who make it over the limit, for a negotiated "goals" contract. No vote is lost.. It forces fringe, extremist and "eternal" oppossition parties to compromise and negotiate better terms and it can change elections that are really close.