This is an interesting idea and with something like this I first think of a prototype to see if it is practicable/performant. I've had a look at the API of Tone.js and the first problem I see is that there is no OSC interface to Tone.js (or I just overlook it). This would have to be completely implemented and adapted to TidalCycles.
In principle, TidalCycles does not care where it sends its OSC messages to. There are also approaches to use Max/MSP with Tidal. How complex was/is it there to implement?
Since TidalCycles has its own clock, it must somehow be synchronized with Tone.js or Tone.js clocks must be ignored. And you would have to create a general interface for synthesizer/sampler, effects and their parameters. This is also what SuperDirt does in essence, as far as I understood.
But I also cannot estimate how effort and benefit are in relation to each other. But anything that creates an easy installation/environment for Tidal should be welcome!