Should there be another international language instead of English?

There have already been many in the past and there will certainly be many in the future as social, technological, economic, religious, etc. conditions evolve and different cultures and languages rise to dominance in the world.

English is as transient an international language as Greek, Latin, French, and German were before it over the past 2000+ years. It is impossible to determine at this time what will replace it and when, but something will. It also is not something that can be decided on, all such deliberate attempts to either create (e.g. Esperanto) or legislate an international language have failed and always will fail, as people will use language as they choose.