I am one of your greybeards. In fact, my beard was already pretty grey when Java was introduced and then there were not that many huge, unwieldy libraries, or not many. If I remember correctly, the two selling points of Java were its supposed invulnerability and the fact that for some obscure reason it was touted as the ideal teaching language. So everybody changed their curriculum to Java and the rest is history.
As I see it, applications that rely on user interaction will be served as well by one of the scripting languages and for number crunching the Lord gave us C, vi and make. We should not presume to improve upon His designs