Comment by bewaretheirs

Most of the big TLDs have already converted to algo 13 -- .org is still lingering on algo 8, but .com, .net, .edu, .gov have all converted, so a lot of the DNS traffic is using smaller signatures already.

Changing the algorithm for the root is being studied - see for instance https://lists.icann.org/hyperkitty/list/[email protected]... ; I wouldn't be surprised to see an algo change as part of the next root key rollover.