Why might Protestants benefit from monasticism and the spirituality which sprang forth from it? There are more than a few reasons.
Protestants, especially of the evangelical breed, have tended to be activist in the piety. One Protestant theologian, Mark Noll, has argued this has not always been to their benefit. Noll suggested they have often failed in development of the mind. Coming from the most Protestant of Protestants, the Southern Baptist Church, we would also argue they have also neglected the contemplative side of a spiritual life. The piety of evangelicals tends to be limited to the individual expression, rather than the group as a whole.
Monasticism, regardless of the flavor, provides a time and place for one's withdrawal from activity. It allows for one to retreat from the world to a place of contemplation which gives balance to what Catholics call the "apostolic life"; or, in more every day terminology "pastoral or missionary work." Being in community negates the unhealthy, and most unchristian, individualism. The faith of the early Church was that of the community as a whole, not the individual.
Secondly, there will come a time when we will all gather with Christ, surrounded by His chosen from not only from every nation but also by His chosen from every branch of Christianity. In Ephesians 3:14-21 Paul prays that we come to know the dimensions of God's reality "with ALL the saints." I like to think the Protestant who wrote off Roman Catholics and the Roman Catholic who wrote off Protestants will find He who prepared the banquet has placed each in a seat next to each other, and just to their left will be the Eastern Orthodox sister both had rejected. Each will find their newly noted brother and sister in Christ. It may well be a good idea that we 'rub shoulders' now rather than being surprised at the greater banquet feast of the Lamb of God.
A third point is given to us from Calvin, himself. He taught that doctrine is learned only when it resides in the heart, passing into our conduct, our interactions with one another, and creation, transforming us into itself in the process. This is the thrust of monastic life, taking the truths of scripture and living them out in community.
The fourth and fifth points will come tomorrow. Perhaps, just perhaps, the world we have manufactured is no where near that which God intended when He began the creation of this universe. Perhaps we are further from His intentions that mankind has ever been at any point in history.
And, just perhaps, with any luck at all, the last sunset has not taken place and we still have time to correct the error of our ways!
Peace and Blessings to each and all!