Snowshoes were good on that trip as it was a stormy time and it is off trail. If little or no more snow falls between now and your trip, I doubt snowshoes will be useful.
By the way, the Whitney Weather page (link above on the left) has more NOAA weather locations besides Whitney Portal, as well as a number of other links. Be SURE to watch those especially close to your trip.
If the weather is clear, people do drive beyond the road closed sign (at their own risk). If no more snow appears, vehicles might be getting pretty close to the Portal. The road is not cleared beyond the sign, so there is always significant rock fall.
