It would be a massive disappointment if Leeds HS2 would be shelved. It's not just about London to Leeds journeys, but Birmingham to Leeds as well. Maybe the ECML could be fiddled with, to speed up the Leeds journeys, but I am unsure about the XC routes.
I hope to take advantage of HS2 for commuting purposes - I still need to travel to London and would need to travel 5 days a week in the future, but I would feel more at home in somewhere like Birmingham rather than the traditional commuter towns and cities. But London is way out of my reach.