So you burn part of or all your alternate fuel in the hold over you destination, you get to your EAT, and the weather has gone below minimums OR and aircraft has blocked the runway due to a burst tire OR the EAT has changed.
All of your options have now gone, apart from being a smoking hole in the ground.
But no different to diverting to the alternate with normal reserves and the same happening. At least with commiting to your destination you have the chance of some extra fuel.