They've started putting decent wines in boxes. There's nothing inherently wrong with boxes, or screw tops, or plastic corks. They prevent further aging, but that's just fine: the vast majority of wines are as good as they'll ever get when they go into the bottle.

The mystique of ultra high-end wines aging for years requires careful conditions, specific wine properties, and is still pretty hit-and miss. For everything else, there's no reason not to package it for convenience rather than tradition.

Boxes used to be used only for bad wines, and there's still plenty of bad wine in boxes, but they've gotten good at making decent reliable wines for cheap. Putting them in a box lowers costs, and it's very nice to be able to take out one glass at a time.