Will it be in 10 years? Will software then support non standard (legacy) features?

Yes. Though you have to *start* with BIP39: you can't take a secret and ask "give me this as BIP39". You can with BIP93. The (multiple!) word lists are sub-optimal, the hashing is awkward and the checksum is so weak it makes me sad. But I ❤️ the 12 words. It's magic UX, which makes my primate brain happy.