What about legal implications with this?
there are none.
if it's implemented as a soft fork, miners are completely in accordance with the protocol. no rules are being broken. they would only be engaging in behavior the network deems valid.
if it's done as a hard fork, it's just an unrelated spinoff of free open source software. there are many such forgotten spinoffs of bitcoin. no damages there either.
this is all moot since it's pretty clear how the community feels about it......it's very unlikely to be attempted. therefore, get your popcorn ready for when QC breaks bitcoin signatures. then the satoshi coins will start moving again!