Old answer, old mistake. I2C has several speed modes: Standard-mode (100kbps), Fast-mode (400kbps), Fast-mode Plus (1Mbps), High-speed mode (3.4Mbps) and Ultra-Fast mode (5Mbps).

UM10204 I2C-bus specification and user manual Rev. 6 - 4 April 2014, section 3.2 (page 23-64) Explains about Ultra-Fast mode, ok? 2014!

So, telling someone to give up a project, being unfamiliar with a subjec or having no or limited knowledge of a topic, that's stupid!

Today, basically all cellphones comunicates in I2C with all modules, even the camera!