They've "lost" a few times by now. Government has propped them up.
The other side of the innovator's dilemma is the fact that the market leaders who don't stick to their current winning formula, instead risking big on a new technology, will sooner or later get it wrong and fail on their own. That's why it's a dilemma.
Not all of them were on the loosing side of that situation JPM had sold off most of risky mortgages in prior years taking a sizable haircut while other banks were supposedly raking it in. There was a ton of pressure on Jamie Dimon not to do it because JPM numbers looked bad compared to peers in those years.
The other side of the innovator's dilemma is the fact that the market leaders who don't stick to their current winning formula, instead risking big on a new technology, will sooner or later get it wrong and fail on their own. That's why it's a dilemma.