Necessity: Surfaces that are mowed and maintained to a sward of playable turf. FWs that are maintained short enough and the ground groomed smooth enough that the ball can be struck with skill and the ball can run with enough predictablility to make it possible to preshot visualise what you'd 'like' to do - but firm enough that it can bound to unexpected places as well, but not to unfair or goofy situations.
Necessity: Putting surfaces that are smooth enough to be able to judge and hit a putt with skill, not just a crap shoot every time. I don't care if speed is the prime factor so much as consistant roll. Bunkers that are sandy, not dirt or stones, and interesting, yet not necessarily well groomed and perfectly raked.
What golf could do without, IMHO, is a sense of classes, pretense, and exclusivity. I would rather see far less private golf clubs and many more public ones. I'd like to see golf more predominently a community recreation venue and supported and maintained to the level of community expectations. I'd like to see golf do with less of a sense of society and more about a sense of sporting recreational or competitive lifestyle.
I'd like to see an economic situation where housing development could be taken out of any golf development project concept.
I'd also like to be 25 again...