Contemporary Protestantism is hardly a shattered and fractured movement. Protestants from many denominations share the same Bible translations, scholars, books, movies, teachers. They see themselves as co-heirs to the Reformation despite they denomination they attend. They tend to form academic alliances and co-opt each other on missions, cultural issues and social justice. They share hymns, praise music, liturgy and general lifestyle.
The worn-out argument that the Body of Christ is torn asunder by "23,000" denominations simply doesn't add up. The fact is that very few Protestant groups see others as enemies or heretics. There is clearly a greater Christian unity in practice. Just like in Catholicism not that long ago or Eastern Orthodoxy now- there is diversity, but still a genuine, real and testable unity.