Heroku, being top dog of the PaaS market, doesn't really have a lot to gain from being able to migrate. Being a market leader, they're already the default for many projects; a standard, easily movable, container for applications would quickly strip away the value they can add to a project. A commodity PaaS deployment platform would quickly drive prices down to nearly bare-metal EC2 prices rather than the high markups that Heroku currently charges.
Redhat's in an interesting position here. They've got a lot of capital & a strong presence in the enterprise but OpenShift is still a minor player in the PaaS market. They have the resources & the credibility to push an open container & give it credibility while also being in a position to benefit financially from commodity containers - anyone that moves from Heroku to hosted OpenShift is a win for them as is any company that goes to RH for their own cloud.
Redhat's in an interesting position here. They've got a lot of capital & a strong presence in the enterprise but OpenShift is still a minor player in the PaaS market. They have the resources & the credibility to push an open container & give it credibility while also being in a position to benefit financially from commodity containers - anyone that moves from Heroku to hosted OpenShift is a win for them as is any company that goes to RH for their own cloud.