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Legacy address types (address types that existed prior to segwit), are not guaranteed to stick around and there has been a little bit of discussion about maybe soft forking them out eventually, but this is not a seriously considered idea yet.
Hopefully it will be possible to maintain backwards compatibility for legacy address types, I started with a Base 58 (Legacy) on my install of Bitcoin Core. Bitcoin wallets should be accessible in a disaster scenario, or also if someone mined Bitcoin a long time ago but didn't sync until recently.
BTC!