This is what IE advocates have been saying since IE9, and it is no more true with IE11 than it was then.

Inertia means IE needs to be significantly better than the alternatives to catch up. It takes time and energy to switch, so the payoff has to make it worth one's while.

When Firefox came out, it offered substantial improvements over IE6. When Chrome came out, it offered substantial improvements over Firefox.

IE11 continues the "hey, we're almost caught up!" tradition that has seen IE's market spiral downward for years. Until a version of IE comes out that earns the reaction "whoa, this is much better than Chrome or Firefox!", the downward spiral will continue.