I'm personally fine with this. FTP is a different protocol, just like BitTorrent. It's not part of the modern web, so it's just another loose end to tie up. Even though it will be around for a while, it's not relevant to Chrome's user audience/usecase.
I'm not fine with this. I'm of the mindset that code written 20 years ago should run today. This is a breaking change on a critical piece of internet infrastructure. Google, by nature of operating the most popular web browser, has a moral obligation to the community to provide a stable environment. There are something like 10^9 webpages out there. How many of these will become less accessible because of this change?…
I'm of the mindset that it should be possible to rub code written 20 years ago, but not always the same way you run code written more recently. Emulation, virtual machines etc all allow access to old work without hobbling future development with backwards compatibility concerns (see: Windows).
In this case, there are plenty of free and open source options for FTP clients. No one is going to have the world closed off to them as a result of this.