Benchmarks will always be used as long as CPUs are sold. The type of benchmarks will change and the traditional compute oriented benchmarks will be replaced with more system and IO throughput ones.
There is a need for a suite of benchmarks that not only measure performance but also power. A spec-power for the new workloads - maybe a cloud-power benchmark suite that measures throughput in transactions/sec/watt.
And can all the self-respecting CPU vendors stop quoting DMIPS?