Not likely. A quick test of several compression formats shows that this file can only be shrunk by about 20KB, so it's already had most of the redundancy removed. Re-encoding the same information as SVG isn't going to make it more compact. What would make for a more compact download would be removing detail: the coastlines could be simplified, and perhaps not all the roads need to be shown. That would also speed up client-side rendering time, which is the biggest downside compared to raster images.