Businesses will certainly care about cost, but just as important will be:
- Customization and fine-tuning capabilities (also 'white labeling' where appropriate)
- Integrations (with 3rd party and in-house services & data stores)
- SLA & performance concerns
- Safety features
Open Source AI will have a place, but may be more towards personal-use and academic work. And it will certainly drive competition with the major players (OpenAI, Google, etc) and push them to innovate more which is starting to play out now.