Dramatically improved application security and performance at the cost of cheap hardware, which for most people gets significant upgrades every few years on desktop and every couple years on mobile, seems like a good trade to me.
Yeah, for most people new Firefox or Chrome is a no brainer. They don't need a browser that can surf the web. They need a fast javascript engine to run a few tabs of applications that just happen to be delivered over HTTPS.
People like me that just want to web surf can disable JS by default and then single process mode -JS is infinitely more secure than a multi-process +JS. Just different use cases.
