I think I’ve addressed that question earlier in this thread- but I understand why you might not want to read through the whole thing just to find those responses. In short, we habitually don’t pre-announce major features nor share the details of our development roadmap. But for this particular question, you should know that the solution isn’t an easy one (technically) and that you should not expect to see anything launched soon. Extensibility as a feature is clearly valued both by our team and by our 3rd-party developer community. And of course also by the users who have come to depend on various extensions for their daily workflow.
Thanks for giving it a try and a closer look. You’re right- there is a large segment of SketchUp users who are well served by a browser-based build. I’m gratified to say that our daily activation metrics show that conclusively. Hopefully, I’ll be able to share some of those numbers with you all soon.
For those folks and for others who find that our web application lacks this or some other critical feature or service… SketchUp Make 2017 remains available and viable on the desktop.
I’m sure our regular 3rd-party extension developers appreciate the concern you’re voicing for them, and I’ll let them share their thoughts with you if they like. Since most of the developers who are building business models around selling extensions have observed that it is SketchUp Pro users who most support them, I think the risk is small. Speaking for SketchUp’s upper management, I assure you that we do carefully consider the impact our product strategy has on this very trusted and valued segment of our community.