There's plenty of time for a turn around I suppose and as a permanent intermediate I am content cruising groomers even though I'd really like to ski some fresh snow. If conditions are really bad there's always the back up plan of a long lunch on a sunny terrace I guess.I am at Val Thorens March 26 - April 3. Standard deviations of snowfall in the Alps are lower than in California but higher than in other North American regions. France is more volatile than Austria. When I was in La Grave in March 2008 it had not snowed in a month.
Most of the big Austrian ski complexes are much lower than the ones in France and thus not a good idea in spring. Ischgl and the areas with glaciers like Solden and Hintertux are the best bets. Val d'Isere is regarded by Fraser and others as the most reliable snow in the Alps. It's second to Zermatt in average ski altitude, probably half north facing and likely in the 300-350 inch range for snowfall at average ski altitude.
I thought Landeck might be decent as a base with the areas you mentioned plus Leck, Obergurgl, Serfaus, Stubai etc within driving range.
We'll see what happens in the next month.