I wouldn't go so far as to say ideas are worthless, just impossible to quantify until enacted and therefore nothing to hang your hat on. Great ideas are great motivators, but should be flexible enough to take reality's criticism and evolve to flow in harmony with the process.
I like this paragraph:
You will never justice to the great when it is served by the mediocre. You will just squeak by. This means that creative managers should be focused on their process and team culture rather than just on chasing ideas. Find the truly motivated individuals and multi-talented players for your team. Give them autonomy and the room to explore (and make mistakes). Hold them accountable to standards of the highest quality. And then build an organization founded on trust and respect between departments. Put in place processes that get results - and practice, practice, practice.
The autonomy and room to explore he's talking about is one of the most important aspects of teamwork. It is, in a way, more ideas. Ideas that have evolved from the reality of process and can renew the motivation of the team. I think ideas can have value, though only if it's constantly in flux, not stale and unyielding like a rusty cage.