To add to [1]: if .io can teach us anything, it's not to build on top of ccTLDs. I'd even call into question whether Google's new global TLDs are in the same class as a .net or .com.
Read especially the last paragraph here: https://www.icann.org/en/blogs/details/the-chagos-archipelag...
I believe that one of two outcomes will occur:
1. The popularity of .io will be incentive enough for Chagos to leave it alone
2. .io is retired and we all have 5 years to deal with it.