IMHO inertia isn't the biggest factor, training requirement is.

I switched recently from mouse to touchpad and ... next day my great ergonomic mouse was basically in a drawer. Meanwhile when I tried to use Tap Strap the first step was to learn combinations with basically no gradient of feedback, it was either success or failure.

Inertia isn't such a big problem if the investment is small but if you have to learn an entirely new way then it's a huge risk.