We are left with the ideas that were popular when UNIX rose to prominence. We are still in an "operating systems" winter. The tough thing about getting out of

We are left with the ideas that were popular when UNIX rose to prominence. We are still in an "operating systems" winter. The tough thing about getting out of a winter is that taste, an understanding of what is good and bad, has been lost because it was never transferred to the next generation. The next generation of system designers will have to (unfortunately) rediscover and rebuild a sense of good taste so that in practice engineers can accurately identify ideas (e.g. capabilities) as good ideas, worth implementing, when other more popular well trodden ideas (e.g. ACL, RBAC) are also on the table.