EIGRP was introduced as Cisco proprietary. Is it an open standard protocol now?
Certainly OSPF is well established as a leading standards based Interior Routing Protocol. I am not sure that Cisco intends to necessarily surpass OSPF. And given the competitive environment I doubt that Juniper will invest any resources to develop an EIGRP capability in their software.
But I do believe that there are a couple of things about this that may be significant in what they represent. For one thing there are a lot of devices that get installed in our networks that want to run a routing protocol on the device. Up to this change the choices for routing protocol were pretty much OSPF or RIP. This change will allow some of those vendors to develop EIGRP support and they may have an easier time selling their product into networks that run EIGRP.
For another thing there are organizations that have policy that directs that they should use software that is standard based. I have had a couple of customers who were entirely Cisco shops but that used OSPF because of such policy. The submission of the IETF draft now means that these organizations may be able to use EIGRP.
That used to be true but it has changed. Cisco has released an IETF draft which describes the protocol and how to use it. So it is now accessible to anyone. See this link for details
At Cisco Live in San Francisco I talked with Peter Paluch and he told me that he has a group of students who are working on writing code that will interoperate with EIGRP. So at this point EIGRP is, in fact, open.