Of course, sooner or later, as requirements keep getting pushed, we might see a similar bottleneck begin to show up with certain kinds of SSD we're starting to see coming to market
One ancient technology I like to keep around are the HyperDuo hybrid SSD/HDD controllers. Just bang on a big juicy HDD and a bog standard SSD and it caches all the hot stuff automatically. Sure - it isn't going to win any benchmarks these days, but it's the best storage I've ever found for my "Steam games I never play" library.