The longer Yahoo! stonewalls, the more and more of these lawsuits are going to pile up.
You can't blame the shareholders for wanting to see a deal after patiently holding on to Yahoo! stock, and you can't blame Yahoo! management for seeking a better deal; but eventually everything has to find an equilibrium and if no better offer presents itself, Yahoo will have to sell.
Right now, it just feels like Yahoo! is delaying the inevitable.