We do not know if an agreement on the adoption of an IAL will ever be made, but it does seem that seeking a global solution to the Language Problem is rational. Either a technological solution can be found, but this would be limited by cost; or one national language (such as English) will be forced onto people, resulting in very different abilities to use the language between native speakers and learners.
It seem that there is no rigorous research currently being done into global language reform. The only people researching the IAL hypothesis, at present are creators and supporters of Planned Languages.
How, if ever, one language will be selected for global auxiliary use is far from known.
Some people believe that different IALS and Regional Auxiliary Languages will co-exist in competition, somewhat like phone companies in deregulated environments. Such a situation could be a necessary - but confusing and frustrating - stage in the process of selecting one IAL for the world.
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