Yes, that is the current drawback of using the new texture compression.
We’re expecting more optimizations to be done for the file format, making it compress a lot more. (in the next few months)
The upside being that you’ll get hardware acceleration on Desktop+HTML5, and that the format is transcoded at runtime (i.e. you can support old and new graphics cards with the same bundle).
We also have other plans to mitigate the size increase. The resource plugins is one of the things I will look into next.