I think you're turning this too corporate too soon.

At this stage your most powerful evangelists will be hobbyists and spare-timers. When I write code, I like to write it open-source. Setting the obviously negative connotation aside, it is objectively true that the GPL code, compiled or no, is a license virus that spreads so fundamentally that linking with non-GPL-compatible code violates the terms. Because the distinction between client and server code is blurred, this makes the territory murky and introduces overhead into the developer's mind as to whether what is being written can ever be open-sourced or not.

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Besides dampening enthusiasm for using Meteor, this can also reduce the quality and usefulness of modules being released. This sounds counter-intuitive, but consider the following hypotheticals:

Company A develops and maintains a production-ready module that is especially useful for anyone using Meteor. However, the legal department says that the company cannot release software under GPLv3 (this is common). Company B and Person Z want to use it, the former with a commercial license, the latter with a open-source license.

Because Company A cannot release the module under a permissive license, they can 1) Release it permissively but in a GPL-incompatible license, thus banning all Person Z's from developing open-source software with it legally, 2) Opt not to release it at all to Person Z, and just license it to Company B. 3) Abandon Meteor for something they can both release openly (to give back and get more eyes and hands) and develop in-house.

Company C uses a closed-source library, because they're required to use it because it's the only one out there, and they're contractually obligated because that's the business they're in. They use Meteor to get the project off the ground and they never move off, because it's what they know and are good at. Company C can never write, for example, a white-label platform to distribute to Company X and Company Y, because at best they could only distribute the platform sans non-GPL parts. And while the licensing is viral, the understanding of it will not be. So it may lead to GPL violations down the road because Company X didn't understand, and Company C may be holding the bag. Legal doesn't want the company to take the risk and assume liability, so it says "no" and kills the project's use of Meteor.

Company D thinks about the hypothetical case of Company C, only it was just founded and is looking at Meteor. Maybe it was founded by Person Z. Because of the hypothetical of Company C, and because Company D doesn't know what their business is yet, they decide to avoid a potential future nightmare and write their own framework. Maybe they open-source it, because it's compelling and useful, and they want to get as many eyeballs and hands on it as they can, improving it.

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tl;dr I was super-excited about Meteor, but now that it's GPL I will not be touching it with a ten foot pole. I am really sad about this.

Because I value developer freedom, I do not use GPL'd code in my projects, even if it is objectively good. Because I support open-source, and want to give back when I can I do not want use Meteor with a commercial license. So because of your choice of license - and for no other reason - I can not and will not use Meteor.