He's building a library, ggml; it's generally not hard to add support for new models. For instance llama.ccp already supports the Falcon 7B model (different architecture to llama). And given how politicised AI has become, there's unlikely to be many companies releasing weights for models competitive with the current models (e.g. LLaMA 65B). They may have private models that are better, like GPT3.5 and GPT4, but you can't run these on your own server so they're not competing with ggml.