As a seminary trained (M-Div) professional lay minister, I would say it is not the laity that do not want or appreciate lay ministry. In fact, it is very much appreciated, respected and trusted. At least that is true of my diocese in the Midwest. Over the years though, my observation would be that the problem is less with bishops and more with younger clergy who are threatened by someone who is well educated and bring a skill set and history  with the parish by virtue of their long time employment. Instead of viewing this as an asset that will enhance their ministry, they resent the relationships and trust that exist with someone other than themselves. In these situations, it isn't long before there is an entire staff turnover - a disservice to the parish as well as the young pastor. This is repeated over and over, so I daresay it is not limited to my experience, nor in my diocese. The older pastors were the most grateful for our presence and always treated us as esteemed colleagues.