It depends on how you envision it: multi-modal can be achieved in one breakthrough, multiple breakthroughs (one after the other for example) or even as not being a breakthrough, ie we already have the technolofy for it (i don't say we do, i give the example of a position).

The thing some might not know here is that the number of possibilities in a poll here are limited to 6, which constrained my choices a bit as you might guess and forced me to be synthetic.