Seppuku swords is a satisfying thought but it also implies they have an ounce of honour among them which is unlikely.
Verizon has already hinted at renegotiating or walking away as there has been a [quite substantial IMO] material change so I imagine the Yahoo execs are shitting themselves that the deal gets called off. Any eBay thoughts the Yahoo execs are having will be limited to either 1. Can we flog Yahoo! to eBay? or 2. I wonder if we can put Yahoo on eBay and get a few quid for it (Paypal only - no time wasters)?
I suspect this will be one of those unusual times where the board fail to get out with their massive golden parachutes before the whole lot implodes.