In the "grand scheme of things", no, it's probably not a big deal. I think in the short term, I think it has the potential to set back the space a few months, as a lot of the ecosystem is still oriented around OpenAI (as they are the best at productivizing). I think that even extends to many community/open source models, which are commonly trained against GPT-4.

If they are able to retain enough people to properly release a GPT-5 with significant performance increases in a few months, I would assume that the effect is less pronounced.