For me, there was something that just seemed off about the language. I mean it's usable and useful and all that jazz, but I just didn't like using it. In some ways, as a language, it feels unfinished, or unpolished, and it seems stuck in its ways. But then there are those who would argue anything different would not be Esperanto, and I can see their point.
For me, the great international language has still to be invented, or perhaps has existed for many decades, but has yet to go viral.
The whole concept of an international language might just be like religion though. There are some that will never embrace it. There are some that will prefer one over the other and never change, and some that might convert.
The solution to a universal language might be multiple universal languages (lol). For example, Occidental, Oriental and African. As long as they are easy to learn while being precise enough that miscommunication through ambiguity is difficult.
You start with the language that is local to you, thus giving you access to many people and local trading partners. Then if you want, you can branch out to areas that interest you. It should even be possible for someone from the African area to speak with another from the Oriental area if both have learned Occidental, for example.
So why the heck did they rename Occidental to something that differs by one letter from another language that they must have known about?!? Just totally baffling.
As for the name change, I think it has a very general meaning, like amongst-language with the e ending being typical for Occidental nouns and the a ending for Interlingua nouns (maybe). Weirdly enough, the name push was by a guy called Ric Berger who was a Occidentalist who moved to Interlingua and probably played a part in naming both languages. BTW, both languages are very similar in vocabulary roots with Interlingua drawing inspiration from Occidental during its development (if I understood correctly).
First thing that springs to mind: So maybe this Berger guy was trying to force or at least encourage a merger?