The PDF specification is an open, backwards compatible standard. It is built upon other open standards, ECMAScript being only one of them. It would take Adobe to turn seriously evil and counter to the existing way PDF has been developed over the years, before they could create lock-in.
Also don't forget that at least one other major PDF renderer exists in the wild that is not controlled by Adobe (AFAIK) - that built into Mac OSX as part of its display/printing subsystem. (Note: I have never used OSX, I'm going from what I read).
If you can stomach the hundreds of pages of specification, the PDF spec is quite an enthralling read. The format is very well designed and specified. +1 to Adobe.
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