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The block size increase proposal currently under discussion would require all clients that process transactions to upgrade.

Otherwise, pre 0.11 clients would reject these larger blocks, leading to a possible double-spend attack against these merchants after Mar 1, 2016.

Will the Bitcoin developers use the alert system to warn these nodes to upgrade?

Nick ODell
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Yes, according to Gavin Andresen via Reddit.

Even if they didn't to do so, Bitcoin Core already has two other mechanisms which will produce automated alerts as the hard fork approaches: one which will take effect before the hard fork occurs, and one after (as per BIP-50).

Christopher Gurnee
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    Thanks for pointing those two out. I noticed that it seems to also disable some RPC commands in addition to showing a warning. https://github.com/bitcoin/bitcoin/blob/fc44231cb72afae2fffe0fac64e236a1d33b90e6/src/init.cpp#L243 – Nick ODell May 04 '15 at 22:24
  • Nice find, I didn't realize that! – Christopher Gurnee May 04 '15 at 22:30