The trick isn't whether these brands can access China, it's in what manner. Western brands sell very well in China, who gets the proceeds is the issue.
The big European luxury goods brands are doing a wild business in China. [1][2][3][4]
If you want to make a lot of money on China as a foreigner, you want to be selling a luxury brand product rather than offering a local service (eg fast food chain). That might be an iPhone or a Gucci bag or a Mercedes. Owning certain intellectual property, such as characters, can be equally lucrative (eg Marvel and Mickey Mouse). Nike and Jordan Brand have done a great business in China.
KFC in China for example, isn't controlled by Yum Brands US. It's controlled by Yum China, minority owned by Yum US. McDonald's has a small sliver of its own business in China.
Disney only owns 43% of its big new $5.5b park in Shanghai, the most popular park in China. Wang Jianlin had touted that he'd personally chase Disney from China, and that his parks would dominate instead. Disney really had no choice but to acquiesce and partner up. They'll make a lot of money from it and they had to cede control to do that.
Tesla is building a factory in China for the same reason everyone else has, there is no great alternative. You have to give local Chinese partners their big cut, or else.
[1] https://www.bloomberg.com/news/articles/2018-07-26/l-oreal-g...
[2] https://www.bloomberg.com/news/articles/2018-07-20/hermes-ex...
[3] https://www.bloomberg.com/news/articles/2018-07-24/lvmh-shin...
[4] https://www.bloomberg.com/news/articles/2017-09-28/luxury-ba...