Perhaps cheaper long-distance travel has something to do with it, but I suspect that it's something that runs even deeper than that: maybe a feeling that enough of the organized life, already!
I remember when the so-called package tours came out, and people would sign up to all the day-trips, barbecues etc. offered by the company tour guides in the resorts. The percentages from those local "experiences" made a handy profit for the travel companies, but today, even the tour guides have been reduced to almost nothing, with somebody meeting you at the airport and pointing you to the bus taking you to your hotel, and then the same backwards when time to quit "your" room. People become blasé; they have seen it all on their first trip; they know the local event's just a low-value scam where they get served rotten food and wine, and pressured to buy something they don't want. One section doesn't want to move out of the hotel or the bar or the disco, and another want's to live on the beach. Crashing out means many things. To some, it means getting as far away from your own countrymen as you possibly can, not herd with them on your only chance of escape.
Perhaps the best thing to be said for the concept of the package is that you are unlikely to be left behind or abandoned should your transfer bus to the airport become delayed. After all, as long as you bought the ticket as part of the package deal... sometimes independent travel ain't the clever option.
Where independent travel is both affordable and you are physically up for it, I'd suggest packing a lot of underwear and jumping into your car and just following its nose. The idea is not to have a destination, but to have a trip. That was how we began our love affair with France, except that yes, we did have destinations in both directions.
I just don't see how you can experience anything much new by locking yourself up in a resort. I'm fairly confident that's why some of those places finally failed. Also, I think surviving resorts of that nature can carry a sort of social stigma today, not that St Moritz need worry any time soon.